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 <sys/ioctl.h>
  57 #include <arpa/inet.h>
  58 #define MAX_BROADCAST_SIZE 1400
  59
  60 extern u_long _create_xid (void);
  61
  62 static const struct timeval timeout = {3, 0};
  63
  64 /*
  65  * pmapper remote-call-service interface.
  66  * This routine is used to call the pmapper remote call service
  67  * which will look up a service program in the port maps, and then
  68  * remotely call that routine with the given parameters.  This allows
  69  * programs to do a lookup and call in one step.
  70  */
  71 enum clnt_stat
  72 pmap_rmtcall (addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  73      struct sockaddr_in *addr;
  74      u_long prog, vers, proc;
  75      xdrproc_t xdrargs, xdrres;
  76      caddr_t argsp, resp;
  77      struct timeval tout;
  78      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,
  99                         (xdrproc_t)INTUSE(xdr_rmtcall_args),
 100                         (caddr_t)&a, (xdrproc_t)INTUSE(xdr_rmtcallres),
 101                         (caddr_t)&r, tout);
 102       CLNT_DESTROY (client);
 103     }
 104   else
 105     {
 106       stat = RPC_FAILED;
 107     }
 108   /* (void)__close(socket); CLNT_DESTROY already closed it */
 109   addr->sin_port = 0;
 110   return stat;
 111 }
 112
 113
 114 /*
 115  * XDR remote call arguments
 116  * written for XDR_ENCODE direction only
 117  */
 118 bool_t
 119 xdr_rmtcall_args (XDR *xdrs, struct rmtcallargs *cap)
 120 {
 121   u_int lenposition, argposition, position;
 122
 123   if (INTUSE(xdr_u_long) (xdrs, &(cap->prog)) &&
 124       INTUSE(xdr_u_long) (xdrs, &(cap->vers)) &&
 125       INTUSE(xdr_u_long) (xdrs, &(cap->proc)))
 126     {
 127       lenposition = XDR_GETPOS (xdrs);
 128       if (!INTUSE(xdr_u_long) (xdrs, &(cap->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 (!INTUSE(xdr_u_long) (xdrs, &(cap->arglen)))
 137         return FALSE;
 138       XDR_SETPOS (xdrs, position);
 139       return TRUE;
 140     }
 141   return FALSE;
 142 }
 143 INTDEF(xdr_rmtcall_args)
 144
 145 /*
 146  * XDR remote call results
 147  * written for XDR_DECODE direction only
 148  */
 149 bool_t
 150 xdr_rmtcallres (xdrs, crp)
 151      XDR *xdrs;
 152      struct rmtcallres *crp;
 153 {
 154   caddr_t port_ptr;
 155
 156   port_ptr = (caddr_t) crp->port_ptr;
 157   if (INTUSE(xdr_reference) (xdrs, &port_ptr, sizeof (u_long),
 158                              (xdrproc_t) INTUSE(xdr_u_long))
 159       && INTUSE(xdr_u_long) (xdrs, &crp->resultslen))
 160     {
 161       crp->port_ptr = (u_long *) port_ptr;
 162       return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
 163     }
 164   return FALSE;
 165 }
 166 INTDEF(xdr_rmtcallres)
 167
 168
 169 /*
 170  * The following is kludged-up support for simple rpc broadcasts.
 171  * Someday a large, complicated system will replace these trivial
 172  * routines which only support udp/ip .
 173  */
 174
 175 static int
 176 internal_function
 177 getbroadcastnets (struct in_addr *addrs, int sock, char *buf)
 178   /* int sock:  any valid socket will do */
 179   /* char *buf: why allocate more when we can use existing... */
 180 {
 181   struct ifconf ifc;
 182   struct ifreq ifreq, *ifr;
 183   struct sockaddr_in *sin;
 184   int n, i;
 185
 186   ifc.ifc_len = UDPMSGSIZE;
 187   ifc.ifc_buf = buf;
 188   if (__ioctl (sock, SIOCGIFCONF, (char *) &ifc) < 0)
 189     {
 190       perror (_("broadcast: ioctl (get interface configuration)"));
 191       return (0);
 192     }
 193   ifr = ifc.ifc_req;
 194   for (i = 0, n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
 195     {
 196       ifreq = *ifr;
 197       if (__ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
 198         {
 199           perror (_("broadcast: ioctl (get interface flags)"));
 200           continue;
 201         }
 202       if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 203           (ifreq.ifr_flags & IFF_UP) &&
 204           ifr->ifr_addr.sa_family == AF_INET)
 205         {
 206           sin = (struct sockaddr_in *) &ifr->ifr_addr;
 207 #ifdef SIOCGIFBRDADDR           /* 4.3BSD */
 208           if (__ioctl (sock, SIOCGIFBRDADDR, (char *) &ifreq) < 0)
 209             {
 210               addrs[i++] = inet_makeaddr (inet_netof
 211               /* Changed to pass struct instead of s_addr member
 212                  by roland@gnu.  */
 213                                           (sin->sin_addr), INADDR_ANY);
 214             }
 215           else
 216             {
 217               addrs[i++] = ((struct sockaddr_in *)
 218                             &ifreq.ifr_addr)->sin_addr;
 219             }
 220 #else /* 4.2 BSD */
 221           addrs[i++] = inet_makeaddr (inet_netof
 222                                       (sin->sin_addr.s_addr), INADDR_ANY);
 223 #endif
 224         }
 225     }
 226   return i;
 227 }
 228
 229
 230 enum clnt_stat
 231 clnt_broadcast (prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 232      u_long prog;               /* program number */
 233      u_long vers;               /* version number */
 234      u_long proc;               /* procedure number */
 235      xdrproc_t xargs;           /* xdr routine for args */
 236      caddr_t argsp;             /* pointer to args */
 237      xdrproc_t xresults;        /* xdr routine for results */
 238      caddr_t resultsp;          /* pointer to results */
 239      resultproc_t eachresult;   /* call with each result obtained */
 240 {
 241   enum clnt_stat stat = RPC_FAILED;
 242   AUTH *unix_auth = authunix_create_default ();
 243   XDR xdr_stream;
 244   XDR *xdrs = &xdr_stream;
 245   struct timeval t;
 246   int outlen, inlen, nets;
 247   socklen_t fromlen;
 248   int sock;
 249   int on = 1;
 250   struct pollfd fd;
 251   int milliseconds;
 252   int i;
 253   bool_t done = FALSE;
 254   u_long xid;
 255   u_long port;
 256   struct in_addr addrs[20];
 257   struct sockaddr_in baddr, raddr;      /* broadcast and response addresses */
 258   struct rmtcallargs a;
 259   struct rmtcallres r;
 260   struct rpc_msg msg;
 261   char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 262
 263   /*
 264    * initialization: create a socket, a broadcast address, and
 265    * preserialize the arguments into a send buffer.
 266    */
 267   if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
 268     {
 269       perror (_("Cannot create socket for broadcast rpc"));
 270       stat = RPC_CANTSEND;
 271       goto done_broad;
 272     }
 273 #ifdef SO_BROADCAST
 274   if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
 275     {
 276       perror (_("Cannot set socket option SO_BROADCAST"));
 277       stat = RPC_CANTSEND;
 278       goto done_broad;
 279     }
 280 #endif /* def SO_BROADCAST */
 281   fd.fd = sock;
 282   fd.events = POLLIN;
 283   nets = getbroadcastnets (addrs, sock, inbuf);
 284   __bzero ((char *) &baddr, sizeof (baddr));
 285   baddr.sin_family = AF_INET;
 286   baddr.sin_port = htons (PMAPPORT);
 287   baddr.sin_addr.s_addr = htonl (INADDR_ANY);
 288 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 289   msg.rm_xid = xid = _create_xid ();
 290   t.tv_usec = 0;
 291   msg.rm_direction = CALL;
 292   msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 293   msg.rm_call.cb_prog = PMAPPROG;
 294   msg.rm_call.cb_vers = PMAPVERS;
 295   msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 296   msg.rm_call.cb_cred = unix_auth->ah_cred;
 297   msg.rm_call.cb_verf = unix_auth->ah_verf;
 298   a.prog = prog;
 299   a.vers = vers;
 300   a.proc = proc;
 301   a.xdr_args = xargs;
 302   a.args_ptr = argsp;
 303   r.port_ptr = &port;
 304   r.xdr_results = xresults;
 305   r.results_ptr = resultsp;
 306   INTUSE(xdrmem_create) (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 307   if ((!INTUSE(xdr_callmsg) (xdrs, &msg))
 308       || (!INTUSE(xdr_rmtcall_args) (xdrs, &a)))
 309     {
 310       stat = RPC_CANTENCODEARGS;
 311       goto done_broad;
 312     }
 313   outlen = (int) xdr_getpos (xdrs);
 314   xdr_destroy (xdrs);
 315   /*
 316    * Basic loop: broadcast a packet and wait a while for response(s).
 317    * The response timeout grows larger per iteration.
 318    */
 319   for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
 320     {
 321       for (i = 0; i < nets; i++)
 322         {
 323           baddr.sin_addr = addrs[i];
 324           if (sendto (sock, outbuf, outlen, 0,
 325                       (struct sockaddr *) &baddr,
 326                       sizeof (struct sockaddr)) != outlen)
 327             {
 328               perror (_("Cannot send broadcast packet"));
 329               stat = RPC_CANTSEND;
 330               goto done_broad;
 331             }
 332         }
 333       if (eachresult == NULL)
 334         {
 335           stat = RPC_SUCCESS;
 336           goto done_broad;
 337         }
 338     recv_again:
 339       msg.acpted_rply.ar_verf = _null_auth;
 340       msg.acpted_rply.ar_results.where = (caddr_t) & r;
 341       msg.acpted_rply.ar_results.proc = (xdrproc_t) INTUSE(xdr_rmtcallres);
 342       milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
 343       switch (__poll(&fd, 1, milliseconds))
 344         {
 345
 346         case 0:         /* timed out */
 347           stat = RPC_TIMEDOUT;
 348           continue;
 349
 350         case -1:                /* some kind of error */
 351           if (errno == EINTR)
 352             goto recv_again;
 353           perror (_("Broadcast poll problem"));
 354           stat = RPC_CANTRECV;
 355           goto done_broad;
 356
 357         }                       /* end of poll results switch */
 358     try_again:
 359       fromlen = sizeof (struct sockaddr);
 360       inlen = recvfrom (sock, inbuf, UDPMSGSIZE, 0,
 361                         (struct sockaddr *) &raddr, &fromlen);
 362       if (inlen < 0)
 363         {
 364           if (errno == EINTR)
 365             goto try_again;
 366           perror (_("Cannot receive reply to broadcast"));
 367           stat = RPC_CANTRECV;
 368           goto done_broad;
 369         }
 370       if ((size_t) inlen < sizeof (u_long))
 371         goto recv_again;
 372       /*
 373        * see if reply transaction id matches sent id.
 374        * If so, decode the results.
 375        */
 376       INTUSE(xdrmem_create) (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
 377       if (INTUSE(xdr_replymsg) (xdrs, &msg))
 378         {
 379           if (((u_int32_t) msg.rm_xid == (u_int32_t) xid) &&
 380               (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 381               (msg.acpted_rply.ar_stat == SUCCESS))
 382             {
 383               raddr.sin_port = htons ((u_short) port);
 384               done = (*eachresult) (resultsp, &raddr);
 385             }
 386           /* otherwise, we just ignore the errors ... */
 387         }
 388       else
 389         {
 390 #ifdef notdef
 391           /* some kind of deserialization problem ... */
 392           if ((u_int32_t) msg.rm_xid == (u_int32_t) xid)
 393             fprintf (stderr, "Broadcast deserialization problem");
 394           /* otherwise, just random garbage */
 395 #endif
 396         }
 397       xdrs->x_op = XDR_FREE;
 398       msg.acpted_rply.ar_results.proc = (xdrproc_t)INTUSE(xdr_void);
 399       (void) INTUSE(xdr_replymsg) (xdrs, &msg);
 400       (void) (*xresults) (xdrs, resultsp);
 401       xdr_destroy (xdrs);
 402       if (done)
 403         {
 404           stat = RPC_SUCCESS;
 405           goto done_broad;
 406         }
 407       else
 408         {
 409           goto recv_again;
 410         }
 411     }
 412 done_broad:
 413   (void) __close (sock);
 414   AUTH_DESTROY (unix_auth);
 415   return stat;
 416 }