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 <rpc/rpc.h>
  43 #include <rpc/pmap_prot.h>
  44 #include <rpc/pmap_clnt.h>
  45 #include <rpc/pmap_rmt.h>
  46 #include <sys/socket.h>
  47 #include <stdio.h>
  48 #include <errno.h>
  49 #undef   _POSIX_SOURCE          /* Ultrix <sys/param.h> needs --roland@gnu */
  50 #include <sys/param.h>          /* Ultrix needs before net/if --roland@gnu */
  51 #include <net/if.h>
  52 #include <sys/ioctl.h>
  53 #include <arpa/inet.h>
  54 #define MAX_BROADCAST_SIZE 1400
  55
  56 #ifndef errno
  57 extern int errno;
  58 #endif
  59 static struct timeval timeout = { 3, 0 };
  60
  61
  62 /*
  63  * pmapper remote-call-service interface.
  64  * This routine is used to call the pmapper remote call service
  65  * which will look up a service program in the port maps, and then
  66  * remotely call that routine with the given parameters.  This allows
  67  * programs to do a lookup and call in one step.
  68 */
  69 enum clnt_stat
  70 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  71         struct sockaddr_in *addr;
  72         u_long prog, vers, proc;
  73         xdrproc_t xdrargs, xdrres;
  74         caddr_t argsp, resp;
  75         struct timeval tout;
  76         u_long *port_ptr;
  77 {
  78         int socket = -1;
  79         register CLIENT *client;
  80         struct rmtcallargs a;
  81         struct rmtcallres r;
  82         enum clnt_stat stat;
  83
  84         addr->sin_port = htons(PMAPPORT);
  85         client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
  86         if (client != (CLIENT *)NULL) {
  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, xdr_rmtcall_args, &a,
  96                     xdr_rmtcallres, &r, tout);
  97                 CLNT_DESTROY(client);
  98         } else {
  99                 stat = RPC_FAILED;
 100         }
 101         /* (void)close(socket); CLNT_DESTROY already closed it */
 102         addr->sin_port = 0;
 103         return (stat);
 104 }
 105
 106
 107 /*
 108  * XDR remote call arguments
 109  * written for XDR_ENCODE direction only
 110  */
 111 bool_t
 112 xdr_rmtcall_args(xdrs, cap)
 113         register XDR *xdrs;
 114         register struct rmtcallargs *cap;
 115 {
 116         u_int lenposition, argposition, position;
 117
 118         if (xdr_u_long(xdrs, &(cap->prog)) &&
 119             xdr_u_long(xdrs, &(cap->vers)) &&
 120             xdr_u_long(xdrs, &(cap->proc))) {
 121                 lenposition = XDR_GETPOS(xdrs);
 122                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 123                     return (FALSE);
 124                 argposition = XDR_GETPOS(xdrs);
 125                 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
 126                     return (FALSE);
 127                 position = XDR_GETPOS(xdrs);
 128                 cap->arglen = (u_long)position - (u_long)argposition;
 129                 XDR_SETPOS(xdrs, lenposition);
 130                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 131                     return (FALSE);
 132                 XDR_SETPOS(xdrs, position);
 133                 return (TRUE);
 134         }
 135         return (FALSE);
 136 }
 137
 138 /*
 139  * XDR remote call results
 140  * written for XDR_DECODE direction only
 141  */
 142 bool_t
 143 xdr_rmtcallres(xdrs, crp)
 144         register XDR *xdrs;
 145         register struct rmtcallres *crp;
 146 {
 147         caddr_t port_ptr;
 148
 149         port_ptr = (caddr_t)crp->port_ptr;
 150         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),
 151             xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 152                 crp->port_ptr = (u_long *)port_ptr;
 153                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 154         }
 155         return (FALSE);
 156 }
 157
 158
 159 /*
 160  * The following is kludged-up support for simple rpc broadcasts.
 161  * Someday a large, complicated system will replace these trivial
 162  * routines which only support udp/ip .
 163  */
 164
 165 static int
 166 getbroadcastnets(addrs, sock, buf)
 167         struct in_addr *addrs;
 168         int sock;  /* any valid socket will do */
 169         char *buf;  /* why allocate more when we can use existing... */
 170 {
 171         struct ifconf ifc;
 172         struct ifreq ifreq, *ifr;
 173         struct sockaddr_in *sin;
 174         int n, i;
 175
 176         ifc.ifc_len = UDPMSGSIZE;
 177         ifc.ifc_buf = buf;
 178         if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 179                 perror(_("broadcast: ioctl (get interface configuration)"));
 180                 return (0);
 181         }
 182         ifr = ifc.ifc_req;
 183         for (i = 0, n = ifc.ifc_len/sizeof (struct ifreq); n > 0; n--, ifr++) {
 184                 ifreq = *ifr;
 185                 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 186                         perror(_("broadcast: ioctl (get interface flags)"));
 187                         continue;
 188                 }
 189                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 190                     (ifreq.ifr_flags & IFF_UP) &&
 191                     ifr->ifr_addr.sa_family == AF_INET) {
 192                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 193 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 194                         if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 195                                 addrs[i++] = inet_makeaddr(inet_netof
 196                             /* Changed to pass struct instead of s_addr member
 197                                by roland@gnu.  */
 198                             (sin->sin_addr), INADDR_ANY);
 199                         } else {
 200                                 addrs[i++] = ((struct sockaddr_in*)
 201                                   &ifreq.ifr_addr)->sin_addr;
 202                         }
 203 #else /* 4.2 BSD */
 204                         addrs[i++] = inet_makeaddr(inet_netof
 205                           (sin->sin_addr.s_addr), INADDR_ANY);
 206 #endif
 207                 }
 208         }
 209         return (i);
 210 }
 211
 212
 213 enum clnt_stat
 214 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 215         u_long          prog;           /* program number */
 216         u_long          vers;           /* version number */
 217         u_long          proc;           /* procedure number */
 218         xdrproc_t       xargs;          /* xdr routine for args */
 219         caddr_t         argsp;          /* pointer to args */
 220         xdrproc_t       xresults;       /* xdr routine for results */
 221         caddr_t         resultsp;       /* pointer to results */
 222         resultproc_t    eachresult;     /* call with each result obtained */
 223 {
 224         enum clnt_stat stat;
 225         AUTH *unix_auth = authunix_create_default();
 226         XDR xdr_stream;
 227         register XDR *xdrs = &xdr_stream;
 228         int outlen, inlen, fromlen, nets;
 229         register int sock;
 230         int on = 1;
 231 #ifdef FD_SETSIZE
 232         fd_set mask;
 233         fd_set readfds;
 234 #else
 235         int readfds;
 236         register int mask;
 237 #endif /* def FD_SETSIZE */
 238         register int i;
 239         bool_t done = FALSE;
 240         register u_long xid;
 241         u_long port;
 242         struct in_addr addrs[20];
 243         struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
 244         struct rmtcallargs a;
 245         struct rmtcallres r;
 246         struct rpc_msg msg;
 247         struct timeval t, t1;
 248         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 249
 250         /*
 251          * initialization: create a socket, a broadcast address, and
 252          * preserialize the arguments into a send buffer.
 253          */
 254         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 255                 perror(_("Cannot create socket for broadcast rpc"));
 256                 stat = RPC_CANTSEND;
 257                 goto done_broad;
 258         }
 259 #ifdef SO_BROADCAST
 260         if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 261                 perror(_("Cannot set socket option SO_BROADCAST"));
 262                 stat = RPC_CANTSEND;
 263                 goto done_broad;
 264         }
 265 #endif /* def SO_BROADCAST */
 266 #ifdef FD_SETSIZE
 267         FD_ZERO(&mask);
 268         FD_SET(sock, &mask);
 269 #else
 270         mask = (1 << sock);
 271 #endif /* def FD_SETSIZE */
 272         nets = getbroadcastnets(addrs, sock, inbuf);
 273         bzero((char *)&baddr, sizeof (baddr));
 274         baddr.sin_family = AF_INET;
 275         baddr.sin_port = htons(PMAPPORT);
 276         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 277 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 278         (void)gettimeofday(&t, (struct timezone *)0);
 279         msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec;
 280         t.tv_usec = 0;
 281         msg.rm_direction = CALL;
 282         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 283         msg.rm_call.cb_prog = PMAPPROG;
 284         msg.rm_call.cb_vers = PMAPVERS;
 285         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 286         msg.rm_call.cb_cred = unix_auth->ah_cred;
 287         msg.rm_call.cb_verf = unix_auth->ah_verf;
 288         a.prog = prog;
 289         a.vers = vers;
 290         a.proc = proc;
 291         a.xdr_args = xargs;
 292         a.args_ptr = argsp;
 293         r.port_ptr = &port;
 294         r.xdr_results = xresults;
 295         r.results_ptr = resultsp;
 296         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 297         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 298                 stat = RPC_CANTENCODEARGS;
 299                 goto done_broad;
 300         }
 301         outlen = (int)xdr_getpos(xdrs);
 302         xdr_destroy(xdrs);
 303         /*
 304          * Basic loop: broadcast a packet and wait a while for response(s).
 305          * The response timeout grows larger per iteration.
 306          */
 307         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 308                 for (i = 0; i < nets; i++) {
 309                         baddr.sin_addr = addrs[i];
 310                         if (sendto(sock, outbuf, outlen, 0,
 311                                 (struct sockaddr *)&baddr,
 312                                 sizeof (struct sockaddr)) != outlen) {
 313                                 perror(_("Cannot send broadcast packet"));
 314                                 stat = RPC_CANTSEND;
 315                                 goto done_broad;
 316                         }
 317                 }
 318                 if (eachresult == NULL) {
 319                         stat = RPC_SUCCESS;
 320                         goto done_broad;
 321                 }
 322         recv_again:
 323                 msg.acpted_rply.ar_verf = _null_auth;
 324                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 325                 msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
 326                 readfds = mask;
 327                 t1 = t;
 328                 switch (select(_rpc_dtablesize(), &readfds, (int *)NULL,
 329                                (int *)NULL, &t1)) {
 330
 331                 case 0:  /* timed out */
 332                         stat = RPC_TIMEDOUT;
 333                         continue;
 334
 335                 case -1:  /* some kind of error */
 336                         if (errno == EINTR)
 337                                 goto recv_again;
 338                         perror(_("Broadcast select problem"));
 339                         stat = RPC_CANTRECV;
 340                         goto done_broad;
 341
 342                 }  /* end of select results switch */
 343         try_again:
 344                 fromlen = sizeof(struct sockaddr);
 345                 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0,
 346                         (struct sockaddr *)&raddr, &fromlen);
 347                 if (inlen < 0) {
 348                         if (errno == EINTR)
 349                                 goto try_again;
 350                         perror(_("Cannot receive reply to broadcast"));
 351                         stat = RPC_CANTRECV;
 352                         goto done_broad;
 353                 }
 354                 if (inlen < sizeof(u_long))
 355                         goto recv_again;
 356                 /*
 357                  * see if reply transaction id matches sent id.
 358                  * If so, decode the results.
 359                  */
 360                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 361                 if (xdr_replymsg(xdrs, &msg)) {
 362                         if ((msg.rm_xid == xid) &&
 363                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 364                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 365                                 raddr.sin_port = htons((u_short)port);
 366                                 done = (*eachresult)(resultsp, &raddr);
 367                         }
 368                         /* otherwise, we just ignore the errors ... */
 369                 } else {
 370 #ifdef notdef
 371                         /* some kind of deserialization problem ... */
 372                         if (msg.rm_xid == xid)
 373                                 fprintf(stderr, "Broadcast deserialization problem");
 374                         /* otherwise, just random garbage */
 375 #endif
 376                 }
 377                 xdrs->x_op = XDR_FREE;
 378                 msg.acpted_rply.ar_results.proc = xdr_void;
 379                 (void)xdr_replymsg(xdrs, &msg);
 380                 (void)(*xresults)(xdrs, resultsp);
 381                 xdr_destroy(xdrs);
 382                 if (done) {
 383                         stat = RPC_SUCCESS;
 384                         goto done_broad;
 385                 } else {
 386                         goto recv_again;
 387                 }
 388         }
 389 done_broad:
 390         (void)close(sock);
 391         AUTH_DESTROY(unix_auth);
 392         return (stat);
 393 }