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 0
  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 #define __FORCE_GLIBC
  43 #include <features.h>
  44
  45 #include <unistd.h>
  46 #include <string.h>
  47 #include <rpc/rpc.h>
  48 #include <rpc/pmap_prot.h>
  49 #include <rpc/pmap_clnt.h>
  50 #include <rpc/pmap_rmt.h>
  51 #include <sys/poll.h>
  52 #include <sys/socket.h>
  53 #include <stdio.h>
  54 #include <errno.h>
  55 #undef   _POSIX_SOURCE          /* Ultrix <sys/param.h> needs --roland@gnu */
  56 #include <sys/param.h>          /* Ultrix needs before net/if --roland@gnu */
  57 #include <net/if.h>
  58 #include <sys/ioctl.h>
  59 #include <arpa/inet.h>
  60 #define MAX_BROADCAST_SIZE 1400
  61
  62
  63
  64 extern u_long _create_xid (void) attribute_hidden;
  65
  66 static const struct timeval timeout = {3, 0};
  67
  68 /*
  69  * pmapper remote-call-service interface.
  70  * This routine is used to call the pmapper remote call service
  71  * which will look up a service program in the port maps, and then
  72  * remotely call that routine with the given parameters.  This allows
  73  * programs to do a lookup and call in one step.
  74  */
  75 enum clnt_stat
  76 pmap_rmtcall (struct sockaddr_in *addr, u_long prog, u_long vers, u_long proc,
  77                           xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp,
  78                           struct timeval tout, u_long *port_ptr)
  79 {
  80   int _socket = -1;
  81   CLIENT *client;
  82   struct rmtcallargs a;
  83   struct rmtcallres r;
  84   enum clnt_stat stat;
  85
  86   addr->sin_port = htons (PMAPPORT);
  87   client = clntudp_create (addr, PMAPPROG, PMAPVERS, timeout, &_socket);
  88   if (client != (CLIENT *) NULL)
  89     {
  90       a.prog = prog;
  91       a.vers = vers;
  92       a.proc = proc;
  93       a.args_ptr = argsp;
  94       a.xdr_args = xdrargs;
  95       r.port_ptr = port_ptr;
  96       r.results_ptr = resp;
  97       r.xdr_results = xdrres;
  98       stat = CLNT_CALL (client, PMAPPROC_CALLIT, (xdrproc_t)xdr_rmtcall_args,
  99                         (caddr_t)&a, (xdrproc_t)xdr_rmtcallres,
 100                         (caddr_t)&r, tout);
 101       CLNT_DESTROY (client);
 102     }
 103   else
 104     {
 105       stat = RPC_FAILED;
 106     }
 107   /* (void)close(_socket); CLNT_DESTROY already closed it */
 108   addr->sin_port = 0;
 109   return stat;
 110 }
 111
 112
 113 /*
 114  * XDR remote call arguments
 115  * written for XDR_ENCODE direction only
 116  */
 117 bool_t
 118 xdr_rmtcall_args (XDR *xdrs, struct rmtcallargs *cap)
 119 {
 120   u_int lenposition, argposition, position;
 121
 122   if (xdr_u_long (xdrs, &(cap->prog)) &&
 123       xdr_u_long (xdrs, &(cap->vers)) &&
 124       xdr_u_long (xdrs, &(cap->proc)))
 125     {
 126       u_long dummy_arglen = 0;
 127       lenposition = XDR_GETPOS (xdrs);
 128       if (!xdr_u_long (xdrs, &dummy_arglen))
 129         return FALSE;
 130       argposition = XDR_GETPOS (xdrs);
 131       if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
 132         return FALSE;
 133       position = XDR_GETPOS (xdrs);
 134       cap->arglen = (u_long) position - (u_long) argposition;
 135       XDR_SETPOS (xdrs, lenposition);
 136       if (!xdr_u_long (xdrs, &(cap->arglen)))
 137         return FALSE;
 138       XDR_SETPOS (xdrs, position);
 139       return TRUE;
 140     }
 141   return FALSE;
 142 }
 143 libc_hidden_def(xdr_rmtcall_args)
 144
 145 /*
 146  * XDR remote call results
 147  * written for XDR_DECODE direction only
 148  */
 149 bool_t
 150 xdr_rmtcallres (XDR *xdrs, struct rmtcallres *crp)
 151 {
 152   caddr_t port_ptr;
 153
 154   port_ptr = (caddr_t) crp->port_ptr;
 155   if (xdr_reference (xdrs, &port_ptr, sizeof (u_long), (xdrproc_t) xdr_u_long)
 156       && xdr_u_long (xdrs, &crp->resultslen))
 157     {
 158       crp->port_ptr = (u_long *) port_ptr;
 159       return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
 160     }
 161   return FALSE;
 162 }
 163 libc_hidden_def(xdr_rmtcallres)
 164
 165
 166 /*
 167  * The following is kludged-up support for simple rpc broadcasts.
 168  * Someday a large, complicated system will replace these trivial
 169  * routines which only support udp/ip .
 170  */
 171
 172 static int
 173 internal_function
 174 getbroadcastnets (struct in_addr *addrs, int sock, char *buf)
 175   /* int sock:  any valid socket will do */
 176   /* char *buf: why allocate more when we can use existing... */
 177 {
 178   struct ifconf ifc;
 179   struct ifreq ifreq, *ifr;
 180   struct sockaddr_in *sin;
 181   int n, i;
 182
 183   ifc.ifc_len = UDPMSGSIZE;
 184   ifc.ifc_buf = buf;
 185   if (ioctl (sock, SIOCGIFCONF, (char *) &ifc) < 0)
 186     {
 187       perror (_("broadcast: ioctl (get interface configuration)"));
 188       return (0);
 189     }
 190   ifr = ifc.ifc_req;
 191   for (i = 0, n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
 192     {
 193       ifreq = *ifr;
 194       if (ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
 195         {
 196           perror (_("broadcast: ioctl (get interface flags)"));
 197           continue;
 198         }
 199       if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 200           (ifreq.ifr_flags & IFF_UP) &&
 201           ifr->ifr_addr.sa_family == AF_INET)
 202         {
 203           sin = (struct sockaddr_in *) &ifr->ifr_addr;
 204 #ifdef SIOCGIFBRDADDR           /* 4.3BSD */
 205           if (ioctl (sock, SIOCGIFBRDADDR, (char *) &ifreq) < 0)
 206             {
 207               addrs[i++] = inet_makeaddr (inet_netof
 208               /* Changed to pass struct instead of s_addr member
 209                  by roland@gnu.  */
 210                                           (sin->sin_addr), INADDR_ANY);
 211             }
 212           else
 213             {
 214               addrs[i++] = ((struct sockaddr_in *)
 215                             &ifreq.ifr_addr)->sin_addr;
 216             }
 217 #else /* 4.2 BSD */
 218           addrs[i++] = inet_makeaddr (inet_netof
 219                                       (sin->sin_addr.s_addr), INADDR_ANY);
 220 #endif
 221         }
 222     }
 223   return i;
 224 }
 225
 226
 227 enum clnt_stat
 228 clnt_broadcast (
 229      u_long prog,               /* program number */
 230      u_long vers,               /* version number */
 231      u_long proc,               /* procedure number */
 232      xdrproc_t xargs,           /* xdr routine for args */
 233      caddr_t argsp,             /* pointer to args */
 234      xdrproc_t xresults,        /* xdr routine for results */
 235      caddr_t resultsp,          /* pointer to results */
 236      resultproc_t eachresult    /* call with each result obtained */)
 237 {
 238   enum clnt_stat stat = RPC_FAILED;
 239   AUTH *unix_auth = authunix_create_default ();
 240   XDR xdr_stream;
 241   XDR *xdrs = &xdr_stream;
 242   struct timeval t;
 243   int outlen, inlen, nets;
 244   socklen_t fromlen;
 245   int sock;
 246   int on = 1;
 247   struct pollfd fd;
 248   int milliseconds;
 249   int i;
 250   bool_t done = FALSE;
 251   u_long xid;
 252   u_long port;
 253   struct in_addr addrs[20];
 254   struct sockaddr_in baddr, raddr;      /* broadcast and response addresses */
 255   struct rmtcallargs a;
 256   struct rmtcallres r;
 257   struct rpc_msg msg;
 258   char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 259
 260   /*
 261    * initialization: create a socket, a broadcast address, and
 262    * preserialize the arguments into a send buffer.
 263    */
 264   if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
 265     {
 266       perror (_("Cannot create socket for broadcast rpc"));
 267       stat = RPC_CANTSEND;
 268       goto done_broad;
 269     }
 270 #ifdef SO_BROADCAST
 271   if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
 272     {
 273       perror (_("Cannot set socket option SO_BROADCAST"));
 274       stat = RPC_CANTSEND;
 275       goto done_broad;
 276     }
 277 #endif /* def SO_BROADCAST */
 278   fd.fd = sock;
 279   fd.events = POLLIN;
 280   nets = getbroadcastnets (addrs, sock, inbuf);
 281   memset ((char *) &baddr, 0, sizeof (baddr));
 282   baddr.sin_family = AF_INET;
 283   baddr.sin_port = htons (PMAPPORT);
 284   baddr.sin_addr.s_addr = htonl (INADDR_ANY);
 285 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 286   msg.rm_xid = xid = _create_xid ();
 287   t.tv_usec = 0;
 288   msg.rm_direction = CALL;
 289   msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 290   msg.rm_call.cb_prog = PMAPPROG;
 291   msg.rm_call.cb_vers = PMAPVERS;
 292   msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 293   msg.rm_call.cb_cred = unix_auth->ah_cred;
 294   msg.rm_call.cb_verf = unix_auth->ah_verf;
 295   a.prog = prog;
 296   a.vers = vers;
 297   a.proc = proc;
 298   a.xdr_args = xargs;
 299   a.args_ptr = argsp;
 300   r.port_ptr = &port;
 301   r.xdr_results = xresults;
 302   r.results_ptr = resultsp;
 303   xdrmem_create (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 304   if ((!xdr_callmsg (xdrs, &msg)) || (!xdr_rmtcall_args (xdrs, &a)))
 305     {
 306       stat = RPC_CANTENCODEARGS;
 307       goto done_broad;
 308     }
 309   outlen = (int) xdr_getpos (xdrs);
 310   xdr_destroy (xdrs);
 311   /*
 312    * Basic loop: broadcast a packet and wait a while for response(s).
 313    * The response timeout grows larger per iteration.
 314    */
 315   for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
 316     {
 317       for (i = 0; i < nets; i++)
 318         {
 319           baddr.sin_addr = addrs[i];
 320           if (sendto (sock, outbuf, outlen, 0,
 321                       (struct sockaddr *) &baddr,
 322                       sizeof (struct sockaddr)) != outlen)
 323             {
 324               perror (_("Cannot send broadcast packet"));
 325               stat = RPC_CANTSEND;
 326               goto done_broad;
 327             }
 328         }
 329       if (eachresult == NULL)
 330         {
 331           stat = RPC_SUCCESS;
 332           goto done_broad;
 333         }
 334     recv_again:
 335       msg.acpted_rply.ar_verf = _null_auth;
 336       msg.acpted_rply.ar_results.where = (caddr_t) & r;
 337       msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_rmtcallres;
 338       milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
 339       switch (poll(&fd, 1, milliseconds))
 340         {
 341
 342         case 0:         /* timed out */
 343           stat = RPC_TIMEDOUT;
 344           continue;
 345
 346         case -1:                /* some kind of error */
 347           if (errno == EINTR)
 348             goto recv_again;
 349           perror (_("Broadcast poll problem"));
 350           stat = RPC_CANTRECV;
 351           goto done_broad;
 352
 353         }                       /* end of poll results switch */
 354     try_again:
 355       fromlen = sizeof (struct sockaddr);
 356       inlen = recvfrom (sock, inbuf, UDPMSGSIZE, 0,
 357                         (struct sockaddr *) &raddr, &fromlen);
 358       if (inlen < 0)
 359         {
 360           if (errno == EINTR)
 361             goto try_again;
 362           perror (_("Cannot receive reply to broadcast"));
 363           stat = RPC_CANTRECV;
 364           goto done_broad;
 365         }
 366       if ((size_t) inlen < sizeof (u_long))
 367         goto recv_again;
 368       /*
 369        * see if reply transaction id matches sent id.
 370        * If so, decode the results.
 371        */
 372       xdrmem_create (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
 373       if (xdr_replymsg (xdrs, &msg))
 374         {
 375           if (((u_int32_t) msg.rm_xid == (u_int32_t) xid) &&
 376               (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 377               (msg.acpted_rply.ar_stat == SUCCESS))
 378             {
 379               raddr.sin_port = htons ((u_short) port);
 380               done = (*eachresult) (resultsp, &raddr);
 381             }
 382           /* otherwise, we just ignore the errors ... */
 383         }
 384       else
 385         {
 386 #ifdef notdef
 387           /* some kind of deserialization problem ... */
 388           if ((u_int32_t) msg.rm_xid == (u_int32_t) xid)
 389             fprintf (stderr, "Broadcast deserialization problem");
 390           /* otherwise, just random garbage */
 391 #endif
 392         }
 393       xdrs->x_op = XDR_FREE;
 394       msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
 395       (void) xdr_replymsg (xdrs, &msg);
 396       (void) (*xresults) (xdrs, resultsp);
 397       xdr_destroy (xdrs);
 398       if (done)
 399         {
 400           stat = RPC_SUCCESS;
 401           goto done_broad;
 402         }
 403       else
 404         {
 405           goto recv_again;
 406         }
 407     }
 408 done_broad:
 409   (void) close (sock);
 410   AUTH_DESTROY (unix_auth);
 411   return stat;
 412 }