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       u_long dummy_arglen = 0;
 129       lenposition = XDR_GETPOS (xdrs);
 130       if (!INTUSE(xdr_u_long) (xdrs, &dummy_arglen))
 131         return FALSE;
 132       argposition = XDR_GETPOS (xdrs);
 133       if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
 134         return FALSE;
 135       position = XDR_GETPOS (xdrs);
 136       cap->arglen = (u_long) position - (u_long) argposition;
 137       XDR_SETPOS (xdrs, lenposition);
 138       if (!INTUSE(xdr_u_long) (xdrs, &(cap->arglen)))
 139         return FALSE;
 140       XDR_SETPOS (xdrs, position);
 141       return TRUE;
 142     }
 143   return FALSE;
 144 }
 145 INTDEF(xdr_rmtcall_args)
 146
 147 /*
 148  * XDR remote call results
 149  * written for XDR_DECODE direction only
 150  */
 151 bool_t
 152 xdr_rmtcallres (xdrs, crp)
 153      XDR *xdrs;
 154      struct rmtcallres *crp;
 155 {
 156   caddr_t port_ptr;
 157
 158   port_ptr = (caddr_t) crp->port_ptr;
 159   if (INTUSE(xdr_reference) (xdrs, &port_ptr, sizeof (u_long),
 160                              (xdrproc_t) INTUSE(xdr_u_long))
 161       && INTUSE(xdr_u_long) (xdrs, &crp->resultslen))
 162     {
 163       crp->port_ptr = (u_long *) port_ptr;
 164       return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
 165     }
 166   return FALSE;
 167 }
 168 INTDEF(xdr_rmtcallres)
 169
 170
 171 /*
 172  * The following is kludged-up support for simple rpc broadcasts.
 173  * Someday a large, complicated system will replace these trivial
 174  * routines which only support udp/ip .
 175  */
 176
 177 static int
 178 internal_function
 179 getbroadcastnets (struct in_addr *addrs, int naddrs)
 180 {
 181   struct ifaddrs *ifa;
 182
 183   if (getifaddrs (&ifa) != 0)
 184     {
 185       perror ("broadcast: getifaddrs");
 186       return 0;
 187     }
 188
 189   int i = 0;
 190   struct ifaddrs *run = ifa;
 191   while (run != NULL && i < naddrs)
 192     {
 193       if ((run->ifa_flags & IFF_BROADCAST) != 0
 194           && (run->ifa_flags & IFF_UP) != 0
 195           && run->ifa_addr != NULL
 196           && run->ifa_addr->sa_family == AF_INET)
 197         /* Copy the broadcast address.  */
 198         addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr;
 199
 200       run = run->ifa_next;
 201     }
 202
 203   freeifaddrs (ifa);
 204
 205   return i;
 206 }
 207
 208
 209 enum clnt_stat
 210 clnt_broadcast (prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 211      u_long prog;               /* program number */
 212      u_long vers;               /* version number */
 213      u_long proc;               /* procedure number */
 214      xdrproc_t xargs;           /* xdr routine for args */
 215      caddr_t argsp;             /* pointer to args */
 216      xdrproc_t xresults;        /* xdr routine for results */
 217      caddr_t resultsp;          /* pointer to results */
 218      resultproc_t eachresult;   /* call with each result obtained */
 219 {
 220   enum clnt_stat stat = RPC_FAILED;
 221   AUTH *unix_auth = INTUSE(authunix_create_default) ();
 222   XDR xdr_stream;
 223   XDR *xdrs = &xdr_stream;
 224   struct timeval t;
 225   int outlen, inlen, nets;
 226   socklen_t fromlen;
 227   int sock;
 228   int on = 1;
 229   struct pollfd fd;
 230   int milliseconds;
 231   int i;
 232   bool_t done = FALSE;
 233   u_long xid;
 234   u_long port;
 235   struct in_addr addrs[20];
 236   struct sockaddr_in baddr, raddr;      /* broadcast and response addresses */
 237   struct rmtcallargs a;
 238   struct rmtcallres r;
 239   struct rpc_msg msg;
 240   char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 241
 242   /*
 243    * initialization: create a socket, a broadcast address, and
 244    * preserialize the arguments into a send buffer.
 245    */
 246   if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
 247     {
 248       perror (_("Cannot create socket for broadcast rpc"));
 249       stat = RPC_CANTSEND;
 250       goto done_broad;
 251     }
 252 #ifdef SO_BROADCAST
 253   if (__setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
 254     {
 255       perror (_("Cannot set socket option SO_BROADCAST"));
 256       stat = RPC_CANTSEND;
 257       goto done_broad;
 258     }
 259 #endif /* def SO_BROADCAST */
 260   fd.fd = sock;
 261   fd.events = POLLIN;
 262   nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0]));
 263   __bzero ((char *) &baddr, sizeof (baddr));
 264   baddr.sin_family = AF_INET;
 265   baddr.sin_port = htons (PMAPPORT);
 266   baddr.sin_addr.s_addr = htonl (INADDR_ANY);
 267 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 268   msg.rm_xid = xid = _create_xid ();
 269   t.tv_usec = 0;
 270   msg.rm_direction = CALL;
 271   msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 272   msg.rm_call.cb_prog = PMAPPROG;
 273   msg.rm_call.cb_vers = PMAPVERS;
 274   msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 275   msg.rm_call.cb_cred = unix_auth->ah_cred;
 276   msg.rm_call.cb_verf = unix_auth->ah_verf;
 277   a.prog = prog;
 278   a.vers = vers;
 279   a.proc = proc;
 280   a.xdr_args = xargs;
 281   a.args_ptr = argsp;
 282   r.port_ptr = &port;
 283   r.xdr_results = xresults;
 284   r.results_ptr = resultsp;
 285   INTUSE(xdrmem_create) (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 286   if ((!INTUSE(xdr_callmsg) (xdrs, &msg))
 287       || (!INTUSE(xdr_rmtcall_args) (xdrs, &a)))
 288     {
 289       stat = RPC_CANTENCODEARGS;
 290       goto done_broad;
 291     }
 292   outlen = (int) xdr_getpos (xdrs);
 293   xdr_destroy (xdrs);
 294   /*
 295    * Basic loop: broadcast a packet and wait a while for response(s).
 296    * The response timeout grows larger per iteration.
 297    */
 298   for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
 299     {
 300       for (i = 0; i < nets; i++)
 301         {
 302           baddr.sin_addr = addrs[i];
 303           if (__sendto (sock, outbuf, outlen, 0,
 304                         (struct sockaddr *) &baddr,
 305                         sizeof (struct sockaddr)) != outlen)
 306             {
 307               perror (_("Cannot send broadcast packet"));
 308               stat = RPC_CANTSEND;
 309               goto done_broad;
 310             }
 311         }
 312       if (eachresult == NULL)
 313         {
 314           stat = RPC_SUCCESS;
 315           goto done_broad;
 316         }
 317     recv_again:
 318       msg.acpted_rply.ar_verf = _null_auth;
 319       msg.acpted_rply.ar_results.where = (caddr_t) & r;
 320       msg.acpted_rply.ar_results.proc = (xdrproc_t) INTUSE(xdr_rmtcallres);
 321       milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
 322       switch (__poll(&fd, 1, milliseconds))
 323         {
 324
 325         case 0:         /* timed out */
 326           stat = RPC_TIMEDOUT;
 327           continue;
 328
 329         case -1:                /* some kind of error */
 330           if (errno == EINTR)
 331             goto recv_again;
 332           perror (_("Broadcast poll problem"));
 333           stat = RPC_CANTRECV;
 334           goto done_broad;
 335
 336         }                       /* end of poll results switch */
 337     try_again:
 338       fromlen = sizeof (struct sockaddr);
 339       inlen = __recvfrom (sock, inbuf, UDPMSGSIZE, 0,
 340                           (struct sockaddr *) &raddr, &fromlen);
 341       if (inlen < 0)
 342         {
 343           if (errno == EINTR)
 344             goto try_again;
 345           perror (_("Cannot receive reply to broadcast"));
 346           stat = RPC_CANTRECV;
 347           goto done_broad;
 348         }
 349       if ((size_t) inlen < sizeof (u_long))
 350         goto recv_again;
 351       /*
 352        * see if reply transaction id matches sent id.
 353        * If so, decode the results.
 354        */
 355       INTUSE(xdrmem_create) (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
 356       if (INTUSE(xdr_replymsg) (xdrs, &msg))
 357         {
 358           if (((u_int32_t) msg.rm_xid == (u_int32_t) xid) &&
 359               (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 360               (msg.acpted_rply.ar_stat == SUCCESS))
 361             {
 362               raddr.sin_port = htons ((u_short) port);
 363               done = (*eachresult) (resultsp, &raddr);
 364             }
 365           /* otherwise, we just ignore the errors ... */
 366         }
 367       else
 368         {
 369 #ifdef notdef
 370           /* some kind of deserialization problem ... */
 371           if ((u_int32_t) msg.rm_xid == (u_int32_t) xid)
 372             fprintf (stderr, "Broadcast deserialization problem");
 373           /* otherwise, just random garbage */
 374 #endif
 375         }
 376       xdrs->x_op = XDR_FREE;
 377       msg.acpted_rply.ar_results.proc = (xdrproc_t)INTUSE(xdr_void);
 378       (void) INTUSE(xdr_replymsg) (xdrs, &msg);
 379       (void) (*xresults) (xdrs, resultsp);
 380       xdr_destroy (xdrs);
 381       if (done)
 382         {
 383           stat = RPC_SUCCESS;
 384           goto done_broad;
 385         }
 386       else
 387         {
 388           goto recv_again;
 389         }
 390     }
 391 done_broad:
 392   (void) __close (sock);
 393   AUTH_DESTROY (unix_auth);
 394   return stat;
 395 }