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