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