sunrpc/clnt_udp6.c

   1 /* @(#)clnt_udp.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[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * clnt_udp.c, Implements a UDP/IP based, client side RPC.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  */
  39
  40 #include <stdio.h>
  41 #include <unistd.h>
  42 #include <rpc/rpc.h>
  43 #include <rpc/xdr.h>
  44 #include <rpc/clnt.h>
  45 #include <sys/poll.h>
  46 #include <sys/socket.h>
  47 #include <sys/ioctl.h>
  48 #include <netdb.h>
  49 #include <errno.h>
  50 #include <rpc/pmap_clnt.h>
  51 #include <net/if.h>
  52
  53 extern bool_t xdr_opaque_auth (XDR *, struct opaque_auth *);
  54 extern u_long _create_xid (void);
  55
  56 /*
  57  * UDP bases client side rpc operations
  58  */
  59 static enum clnt_stat clntudp6_call (CLIENT *, u_long, xdrproc_t, caddr_t,
  60                                      xdrproc_t, caddr_t, struct timeval);
  61 static void clntudp6_abort (void);
  62 static void clntudp6_geterr (CLIENT *, struct rpc_err *);
  63 static bool_t clntudp6_freeres (CLIENT *, xdrproc_t, caddr_t);
  64 static bool_t clntudp6_control (CLIENT *, int, char *);
  65 static void clntudp6_destroy (CLIENT *);
  66
  67 static struct clnt_ops udp6_ops =
  68 {
  69   clntudp6_call,
  70   clntudp6_abort,
  71   clntudp6_geterr,
  72   clntudp6_freeres,
  73   clntudp6_destroy,
  74   clntudp6_control
  75 };
  76
  77 /*
  78  * Private data kept per client handle
  79  */
  80 struct cu_data
  81   {
  82     int cu_sock;
  83     bool_t cu_closeit;
  84     struct sockaddr_in cu_raddr;
  85     int cu_rlen;
  86     struct timeval cu_wait;
  87     struct timeval cu_total;
  88     struct rpc_err cu_error;
  89     XDR cu_outxdrs;
  90     u_int cu_xdrpos;
  91     u_int cu_sendsz;
  92     char *cu_outbuf;
  93     u_int cu_recvsz;
  94     char cu_inbuf[1];
  95   };
  96
  97 /*
  98  * Create a UDP based client handle.
  99  * If *sockp<0, *sockp is set to a newly created UPD socket.
 100  * If raddr->sin_port is 0 a binder on the remote machine
 101  * is consulted for the correct port number.
 102  * NB: It is the clients responsibility to close *sockp.
 103  * NB: The rpch->cl_auth is initialized to null authentication.
 104  *     Caller may wish to set this something more useful.
 105  *
 106  * wait is the amount of time used between retransmitting a call if
 107  * no response has been heard; retransmission occurs until the actual
 108  * rpc call times out.
 109  *
 110  * sendsz and recvsz are the maximum allowable packet sizes that can be
 111  * sent and received.
 112  */
 113 CLIENT *
 114 clntudp6_bufcreate (struct sockaddr_in6 *raddr, u_long program, u_long version,
 115                     struct timeval wait, int *sockp, u_int sendsz,
 116                     u_int recvsz)
 117 {
 118   CLIENT *cl;
 119   struct cu_data *cu = NULL;
 120   struct rpc_msg call_msg;
 121
 122   cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
 123   if (cl == NULL)
 124     {
 125       (void) fprintf (stderr, _("clntudp_create: out of memory\n"));
 126       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 127       rpc_createerr.cf_error.re_errno = errno;
 128       goto fooy;
 129     }
 130   sendsz = ((sendsz + 3) / 4) * 4;
 131   recvsz = ((recvsz + 3) / 4) * 4;
 132   cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
 133   if (cu == NULL)
 134     {
 135       (void) fprintf (stderr, _("clntudp_create: out of memory\n"));
 136       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 137       rpc_createerr.cf_error.re_errno = errno;
 138       goto fooy;
 139     }
 140   cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 141
 142   if (raddr->sin6_port == 0)
 143     {
 144       u_short port;
 145       if ((port =
 146            pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
 147         {
 148           goto fooy;
 149         }
 150       raddr->sin6_port = htons (port);
 151     }
 152   cl->cl_ops = &udp6_ops;
 153   cl->cl_private = (caddr_t) cu;
 154   cu->cu_raddr = *raddr;
 155   cu->cu_rlen = sizeof (cu->cu_raddr);
 156   cu->cu_wait = wait;
 157   cu->cu_total.tv_sec = -1;
 158   cu->cu_total.tv_usec = -1;
 159   cu->cu_sendsz = sendsz;
 160   cu->cu_recvsz = recvsz;
 161   call_msg.rm_xid = _create_xid ();
 162   call_msg.rm_direction = CALL;
 163   call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 164   call_msg.rm_call.cb_prog = program;
 165   call_msg.rm_call.cb_vers = version;
 166   xdrmem_create (&(cu->cu_outxdrs), cu->cu_outbuf,
 167                  sendsz, XDR_ENCODE);
 168   if (!xdr_callhdr (&(cu->cu_outxdrs), &call_msg))
 169     {
 170       goto fooy;
 171     }
 172   cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
 173   if (*sockp < 0)
 174     {
 175       int dontblock = 1;
 176
 177       *sockp = __socket (AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 178       if (*sockp < 0)
 179         {
 180           rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 181           rpc_createerr.cf_error.re_errno = errno;
 182           goto fooy;
 183         }
 184       /* attempt to bind to prov port */
 185       (void) bindresvport6 (*sockp, (struct sockaddr_in6 *) 0);
 186       /* the sockets rpc controls are non-blocking */
 187       (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
 188       cu->cu_closeit = TRUE;
 189     }
 190   else
 191     {
 192       cu->cu_closeit = FALSE;
 193     }
 194   cu->cu_sock = *sockp;
 195   cl->cl_auth = authnone_create ();
 196   return cl;
 197 fooy:
 198   if (cu)
 199     mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
 200   if (cl)
 201     mem_free ((caddr_t) cl, sizeof (CLIENT));
 202   return (CLIENT *) NULL;
 203 }
 204
 205 CLIENT *
 206 clntudp6_create (raddr, program, version, wait, sockp)
 207      struct sockaddr_in *raddr;
 208      u_long program;
 209      u_long version;
 210      struct timeval wait;
 211      int *sockp;
 212 {
 213
 214   return clntudp6_bufcreate (raddr, program, version, wait, sockp,
 215                             UDPMSGSIZE, UDPMSGSIZE);
 216 }
 217
 218 static int
 219 is_network_up (int sock)
 220 {
 221   struct ifconf ifc;
 222   char buf[UDPMSGSIZE];
 223   struct ifreq ifreq, *ifr;
 224   int n;
 225
 226   ifc.ifc_len = sizeof (buf);
 227   ifc.ifc_buf = buf;
 228   if (__ioctl(sock, SIOCGIFCONF, (char *) &ifc) == 0)
 229     {
 230       ifr = ifc.ifc_req;
 231       for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
 232         {
 233           ifreq = *ifr;
 234           if (__ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
 235             break;
 236
 237           if ((ifreq.ifr_flags & IFF_UP)
 238               && ifr->ifr_addr.sa_family == AF_INET)
 239             return 1;
 240         }
 241     }
 242   return 0;
 243 }
 244
 245 static enum clnt_stat
 246 clntudp6_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
 247      CLIENT *cl;        /* client handle */
 248      u_long proc;               /* procedure number */
 249      xdrproc_t xargs;           /* xdr routine for args */
 250      caddr_t argsp;             /* pointer to args */
 251      xdrproc_t xresults;        /* xdr routine for results */
 252      caddr_t resultsp;          /* pointer to results */
 253      struct timeval utimeout;   /* seconds to wait before giving up */
 254 {
 255   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 256   XDR *xdrs;
 257   int outlen = 0;
 258   int inlen;
 259   socklen_t fromlen;
 260   struct pollfd fd;
 261   int milliseconds = (cu->cu_wait.tv_sec * 1000) +
 262     (cu->cu_wait.tv_usec / 1000);
 263   struct sockaddr_in from;
 264   struct rpc_msg reply_msg;
 265   XDR reply_xdrs;
 266   struct timeval time_waited;
 267   bool_t ok;
 268   int nrefreshes = 2;           /* number of times to refresh cred */
 269   struct timeval timeout;
 270   int anyup;                    /* any network interface up */
 271
 272   if (cu->cu_total.tv_usec == -1)
 273     {
 274       timeout = utimeout;       /* use supplied timeout */
 275     }
 276   else
 277     {
 278       timeout = cu->cu_total;   /* use default timeout */
 279     }
 280
 281   time_waited.tv_sec = 0;
 282   time_waited.tv_usec = 0;
 283 call_again:
 284   xdrs = &(cu->cu_outxdrs);
 285   if (xargs == NULL)
 286     goto get_reply;
 287   xdrs->x_op = XDR_ENCODE;
 288   XDR_SETPOS (xdrs, cu->cu_xdrpos);
 289   /*
 290    * the transaction is the first thing in the out buffer
 291    */
 292   (*(u_short *) (cu->cu_outbuf))++;
 293   if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
 294       (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
 295       (!(*xargs) (xdrs, argsp)))
 296     return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 297   outlen = (int) XDR_GETPOS (xdrs);
 298
 299 send_again:
 300   if (sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
 301               (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
 302       != outlen)
 303     {
 304       cu->cu_error.re_errno = errno;
 305       return (cu->cu_error.re_status = RPC_CANTSEND);
 306     }
 307
 308   /*
 309    * Hack to provide rpc-based message passing
 310    */
 311   if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
 312     {
 313       return (cu->cu_error.re_status = RPC_TIMEDOUT);
 314     }
 315  get_reply:
 316   /*
 317    * sub-optimal code appears here because we have
 318    * some clock time to spare while the packets are in flight.
 319    * (We assume that this is actually only executed once.)
 320    */
 321   reply_msg.acpted_rply.ar_verf = _null_auth;
 322   reply_msg.acpted_rply.ar_results.where = resultsp;
 323   reply_msg.acpted_rply.ar_results.proc = xresults;
 324   fd.fd = cu->cu_sock;
 325   fd.events = POLLIN;
 326   anyup = 0;
 327   for (;;)
 328     {
 329       switch (__poll (&fd, 1, milliseconds))
 330         {
 331
 332         case 0:
 333           if (anyup == 0)
 334             {
 335               anyup = is_network_up (cu->cu_sock);
 336               if (!anyup)
 337                 return (cu->cu_error.re_status = RPC_CANTRECV);
 338             }
 339
 340           time_waited.tv_sec += cu->cu_wait.tv_sec;
 341           time_waited.tv_usec += cu->cu_wait.tv_usec;
 342           while (time_waited.tv_usec >= 1000000)
 343             {
 344               time_waited.tv_sec++;
 345               time_waited.tv_usec -= 1000000;
 346             }
 347           if ((time_waited.tv_sec < timeout.tv_sec) ||
 348               ((time_waited.tv_sec == timeout.tv_sec) &&
 349                (time_waited.tv_usec < timeout.tv_usec)))
 350             goto send_again;
 351           return (cu->cu_error.re_status = RPC_TIMEDOUT);
 352
 353           /*
 354            * buggy in other cases because time_waited is not being
 355            * updated.
 356            */
 357         case -1:
 358           if (errno == EINTR)
 359             continue;
 360           cu->cu_error.re_errno = errno;
 361           return (cu->cu_error.re_status = RPC_CANTRECV);
 362         }
 363       do
 364         {
 365           fromlen = sizeof (struct sockaddr);
 366           inlen = recvfrom (cu->cu_sock, cu->cu_inbuf,
 367                             (int) cu->cu_recvsz, 0,
 368                             (struct sockaddr *) &from, &fromlen);
 369         }
 370       while (inlen < 0 && errno == EINTR);
 371       if (inlen < 0)
 372         {
 373           if (errno == EWOULDBLOCK)
 374             continue;
 375           cu->cu_error.re_errno = errno;
 376           return (cu->cu_error.re_status = RPC_CANTRECV);
 377         }
 378       if (inlen < 4)
 379         continue;
 380
 381       /* see if reply transaction id matches sent id.
 382         Don't do this if we only wait for a replay */
 383       if (xargs != NULL
 384           && (*((u_int32_t *) (cu->cu_inbuf))
 385               != *((u_int32_t *) (cu->cu_outbuf))))
 386         continue;
 387       /* we now assume we have the proper reply */
 388       break;
 389     }
 390
 391   /*
 392    * now decode and validate the response
 393    */
 394   xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
 395   ok = xdr_replymsg (&reply_xdrs, &reply_msg);
 396   /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
 397   if (ok)
 398     {
 399       _seterr_reply (&reply_msg, &(cu->cu_error));
 400       if (cu->cu_error.re_status == RPC_SUCCESS)
 401         {
 402           if (!AUTH_VALIDATE (cl->cl_auth,
 403                               &reply_msg.acpted_rply.ar_verf))
 404             {
 405               cu->cu_error.re_status = RPC_AUTHERROR;
 406               cu->cu_error.re_why = AUTH_INVALIDRESP;
 407             }
 408           if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
 409             {
 410               xdrs->x_op = XDR_FREE;
 411               (void) xdr_opaque_auth (xdrs,
 412                                       &(reply_msg.acpted_rply.ar_verf));
 413             }
 414         }                       /* end successful completion */
 415       else
 416         {
 417           /* maybe our credentials need to be refreshed ... */
 418           if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
 419             {
 420               nrefreshes--;
 421               goto call_again;
 422             }
 423         }                       /* end of unsuccessful completion */
 424     }                           /* end of valid reply message */
 425   else
 426     {
 427       cu->cu_error.re_status = RPC_CANTDECODERES;
 428     }
 429   return cu->cu_error.re_status;
 430 }
 431
 432 static void
 433 clntudp6_geterr (CLIENT *cl, struct rpc_err *errp)
 434 {
 435   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 436
 437   *errp = cu->cu_error;
 438 }
 439
 440
 441 static bool_t
 442 clntudp6_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
 443 {
 444   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 445   XDR *xdrs = &(cu->cu_outxdrs);
 446
 447   xdrs->x_op = XDR_FREE;
 448   return (*xdr_res) (xdrs, res_ptr);
 449 }
 450
 451 static void
 452 clntudp6_abort (void)
 453 {
 454 }
 455
 456 static bool_t
 457 clntudp6_control (CLIENT *cl, int request, char *info)
 458 {
 459   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 460
 461   switch (request)
 462     {
 463     case CLSET_FD_CLOSE:
 464       cu->cu_closeit = TRUE;
 465       break;
 466     case CLSET_FD_NCLOSE:
 467       cu->cu_closeit = FALSE;
 468       break;
 469     case CLSET_TIMEOUT:
 470       cu->cu_total = *(struct timeval *) info;
 471       break;
 472     case CLGET_TIMEOUT:
 473       *(struct timeval *) info = cu->cu_total;
 474       break;
 475     case CLSET_RETRY_TIMEOUT:
 476       cu->cu_wait = *(struct timeval *) info;
 477       break;
 478     case CLGET_RETRY_TIMEOUT:
 479       *(struct timeval *) info = cu->cu_wait;
 480       break;
 481     case CLGET_SERVER_ADDR:
 482       *(struct sockaddr_in *) info = cu->cu_raddr;
 483       break;
 484     case CLGET_FD:
 485       *(int *)info = cu->cu_sock;
 486       break;
 487     case CLGET_XID:
 488       /*
 489        * use the knowledge that xid is the
 490        * first element in the call structure *.
 491        * This will get the xid of the PREVIOUS call
 492        */
 493       *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
 494       break;
 495     case CLSET_XID:
 496       /* This will set the xid of the NEXT call */
 497       *(u_long *)cu->cu_outbuf =  htonl(*(u_long *)info - 1);
 498       /* decrement by 1 as clntudp_call() increments once */
 499     case CLGET_VERS:
 500       /*
 501        * This RELIES on the information that, in the call body,
 502        * the version number field is the fifth field from the
 503        * begining of the RPC header. MUST be changed if the
 504        * call_struct is changed
 505        */
 506       *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
 507                                           4 * BYTES_PER_XDR_UNIT));
 508       break;
 509     case CLSET_VERS:
 510       *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
 511         = htonl(*(u_long *)info);
 512       break;
 513     case CLGET_PROG:
 514       /*
 515        * This RELIES on the information that, in the call body,
 516        * the program number field is the  field from the
 517        * begining of the RPC header. MUST be changed if the
 518        * call_struct is changed
 519        */
 520       *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
 521                                           3 * BYTES_PER_XDR_UNIT));
 522       break;
 523     case CLSET_PROG:
 524       *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
 525         = htonl(*(u_long *)info);
 526       break;
 527     /* The following are only possible with TI-RPC */
 528     case CLGET_SVC_ADDR:
 529     case CLSET_SVC_ADDR:
 530     case CLSET_PUSH_TIMOD:
 531     case CLSET_POP_TIMOD:
 532     default:
 533       return FALSE;
 534     }
 535   return TRUE;
 536 }
 537
 538 static void
 539 clntudp6_destroy (CLIENT *cl)
 540 {
 541   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 542
 543   if (cu->cu_closeit)
 544     {
 545       (void) __close (cu->cu_sock);
 546     }
 547   XDR_DESTROY (&(cu->cu_outxdrs));
 548   mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
 549   mem_free ((caddr_t) cl, sizeof (CLIENT));
 550 }