lib/libc/rpc/pmap_rmt.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  * @(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro
  30  * @(#)pmap_rmt.c       2.2 88/08/01 4.0 RPCSRC
  31  * $FreeBSD: src/lib/libc/rpc/pmap_rmt.c,v 1.16.2.1 2002/06/30 23:34:58 iedowse Exp $
  32  * $DragonFly: src/lib/libc/rpc/pmap_rmt.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
  33  */
  34
  35 /*
  36  * pmap_rmt.c
  37  * Client interface to pmap rpc service.
  38  * remote call and broadcast service
  39  *
  40  * Copyright (C) 1984, Sun Microsystems, Inc.
  41  */
  42
  43 #include "namespace.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/socket.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <unistd.h>
  52 #include <errno.h>
  53 #include <string.h>
  54 #include <net/if.h>
  55 #include <sys/ioctl.h>
  56 #include <arpa/inet.h>
  57 #include "un-namespace.h"
  58
  59 #define MAX_BROADCAST_SIZE 1400
  60
  61 static struct timeval timeout = { 3, 0 };
  62
  63 /*
  64  * pmapper remote-call-service interface.
  65  * This routine is used to call the pmapper remote call service
  66  * which will look up a service program in the port maps, and then
  67  * remotely call that routine with the given parameters.  This allows
  68  * programs to do a lookup and call in one step.
  69 */
  70 enum clnt_stat
  71 pmap_rmtcall(struct sockaddr_in *addr, u_long prog, u_long vers, u_long proc,
  72              xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp,
  73              struct timeval tout, u_long *port_ptr)
  74 {
  75         int socket = -1;
  76         CLIENT *client;
  77         struct rmtcallargs a;
  78         struct rmtcallres r;
  79         enum clnt_stat stat;
  80
  81         addr->sin_port = htons(PMAPPORT);
  82         client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
  83         if (client != (CLIENT *)NULL) {
  84                 a.prog = prog;
  85                 a.vers = vers;
  86                 a.proc = proc;
  87                 a.args_ptr = argsp;
  88                 a.xdr_args = xdrargs;
  89                 r.port_ptr = port_ptr;
  90                 r.results_ptr = resp;
  91                 r.xdr_results = xdrres;
  92                 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a,
  93                     xdr_rmtcallres, &r, tout);
  94                 CLNT_DESTROY(client);
  95         } else {
  96                 stat = RPC_FAILED;
  97         }
  98         if (socket != -1)
  99                 _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(XDR *xdrs, struct rmtcallargs *cap)
 111 {
 112         u_int lenposition, argposition, position;
 113
 114         if (xdr_u_long(xdrs, &(cap->prog)) &&
 115             xdr_u_long(xdrs, &(cap->vers)) &&
 116             xdr_u_long(xdrs, &(cap->proc))) {
 117                 lenposition = XDR_GETPOS(xdrs);
 118                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 119                     return (FALSE);
 120                 argposition = XDR_GETPOS(xdrs);
 121                 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
 122                     return (FALSE);
 123                 position = XDR_GETPOS(xdrs);
 124                 cap->arglen = (u_long)position - (u_long)argposition;
 125                 XDR_SETPOS(xdrs, lenposition);
 126                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 127                     return (FALSE);
 128                 XDR_SETPOS(xdrs, position);
 129                 return (TRUE);
 130         }
 131         return (FALSE);
 132 }
 133
 134 /*
 135  * XDR remote call results
 136  * written for XDR_DECODE direction only
 137  */
 138 bool_t
 139 xdr_rmtcallres(XDR *xdrs, struct rmtcallres *crp)
 140 {
 141         caddr_t port_ptr;
 142
 143         port_ptr = (caddr_t)crp->port_ptr;
 144         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),
 145             xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 146                 crp->port_ptr = (u_long *)port_ptr;
 147                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 148         }
 149         return (FALSE);
 150 }
 151
 152
 153 /*
 154  * The following is kludged-up support for simple rpc broadcasts.
 155  * Someday a large, complicated system will replace these trivial
 156  * routines which only support udp/ip .
 157  */
 158
 159 static int
 160 getbroadcastnets(struct in_addr *addrs,
 161                  int sock,              /* any valid socket will do */
 162                  char *buf)             /* why allocxate more when we can use existing... */
 163 {
 164         struct ifconf ifc;
 165         struct ifreq ifreq, *ifr;
 166         struct sockaddr_in *sin;
 167         struct  in_addr addr;
 168         char *cp, *cplim;
 169         int n, i = 0;
 170
 171         ifc.ifc_len = UDPMSGSIZE;
 172         ifc.ifc_buf = buf;
 173         if (_ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 174                 perror("broadcast: ioctl (get interface configuration)");
 175                 return (0);
 176         }
 177 #define max(a, b) (a > b ? a : b)
 178 #define size(p) max((p).sa_len, sizeof(p))
 179         cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
 180         for (cp = buf; cp < cplim;
 181                         cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
 182                 ifr = (struct ifreq *)cp;
 183                 if (ifr->ifr_addr.sa_family != AF_INET)
 184                         continue;
 185                 memcpy(&ifreq, ifr, sizeof(ifreq));
 186                 if (_ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 187                         perror("broadcast: ioctl (get interface flags)");
 188                         continue;
 189                 }
 190                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 191                     (ifreq.ifr_flags & IFF_UP)) {
 192                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 193 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 194                         if (_ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 195                                 addr =
 196                                     inet_makeaddr(inet_netof(sin->sin_addr),
 197                                     INADDR_ANY);
 198                         } else {
 199                                 addr = ((struct sockaddr_in*)
 200                                   &ifreq.ifr_addr)->sin_addr;
 201                         }
 202 #else /* 4.2 BSD */
 203                         addr = inet_makeaddr(inet_netof(sin->sin_addr),
 204                             INADDR_ANY);
 205 #endif
 206                         for (n=i-1; n>=0; n--) {
 207                                 if (addr.s_addr == addrs[n].s_addr)
 208                                         break;
 209                         }
 210                         if (n<0) {
 211                                 addrs[i++] = addr;
 212                         }
 213                 }
 214         }
 215         return (i);
 216 }
 217
 218 typedef bool_t (*resultproc_t)();
 219
 220 enum clnt_stat
 221 clnt_broadcast(u_long prog,             /* program number */
 222                u_long vers,             /* version number */
 223                u_long proc,             /* procedure number */
 224                xdrproc_t xargs,         /* xdr routine for args */
 225                caddr_t argsp,           /* pointer to args */
 226                xdrproc_t xresults,      /* xdr routine for results */
 227                caddr_t resultsp,        /* pointer to results */
 228                resultproc_t eachresult) /* call with each result obtained */
 229 {
 230         enum clnt_stat stat;
 231         AUTH *unix_auth = authunix_create_default();
 232         XDR xdr_stream;
 233         XDR *xdrs = &xdr_stream;
 234         int outlen, inlen, fromlen, nets;
 235         int sock;
 236         int on = 1;
 237         fd_set *fds, readfds;
 238         int i;
 239         bool_t done = FALSE;
 240         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, tv;
 248         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 249         static u_int32_t disrupt;
 250
 251         if (disrupt == 0)
 252                 disrupt = (u_int32_t)(long)resultsp;
 253
 254         /*
 255          * initialization: create a socket, a broadcast address, and
 256          * preserialize the arguments into a send buffer.
 257          */
 258         if ((sock = _socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 259                 perror("Cannot create socket for broadcast rpc");
 260                 stat = RPC_CANTSEND;
 261                 goto done_broad;
 262         }
 263 #ifdef SO_BROADCAST
 264         if (_setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 265                 perror("Cannot set socket option SO_BROADCAST");
 266                 stat = RPC_CANTSEND;
 267                 goto done_broad;
 268         }
 269 #endif /* def SO_BROADCAST */
 270         if (sock + 1 > FD_SETSIZE) {
 271                 int bytes = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
 272                 fds = (fd_set *)malloc(bytes);
 273                 if (fds == NULL) {
 274                         stat = RPC_CANTSEND;
 275                         goto done_broad;
 276                 }
 277                 memset(fds, 0, bytes);
 278         } else {
 279                 fds = &readfds;
 280                 FD_ZERO(fds);
 281         }
 282
 283         nets = getbroadcastnets(addrs, sock, inbuf);
 284         memset(&baddr, 0, sizeof (baddr));
 285         baddr.sin_len = sizeof(struct sockaddr_in);
 286         baddr.sin_family = AF_INET;
 287         baddr.sin_port = htons(PMAPPORT);
 288         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 289         gettimeofday(&t, (struct timezone *)0);
 290         msg.rm_xid = xid = (++disrupt) ^ getpid() ^ t.tv_sec ^ t.tv_usec;
 291         t.tv_usec = 0;
 292         msg.rm_direction = CALL;
 293         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 294         msg.rm_call.cb_prog = PMAPPROG;
 295         msg.rm_call.cb_vers = PMAPVERS;
 296         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 297         msg.rm_call.cb_cred = unix_auth->ah_cred;
 298         msg.rm_call.cb_verf = unix_auth->ah_verf;
 299         a.prog = prog;
 300         a.vers = vers;
 301         a.proc = proc;
 302         a.xdr_args = xargs;
 303         a.args_ptr = argsp;
 304         r.port_ptr = &port;
 305         r.xdr_results = xresults;
 306         r.results_ptr = resultsp;
 307         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 308         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 309                 stat = RPC_CANTENCODEARGS;
 310                 goto done_broad;
 311         }
 312         outlen = (int)xdr_getpos(xdrs);
 313         xdr_destroy(xdrs);
 314         /*
 315          * Basic loop: broadcast a packet and wait a while for response(s).
 316          * The response timeout grows larger per iteration.
 317          *
 318          * XXX This will loop about 5 times the stop. If there are
 319          * lots of signals being received by the process it will quit
 320          * send them all in one quick burst, not paying attention to
 321          * the intended function of sending them slowly over half a
 322          * minute or so
 323          */
 324         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 325                 int success = 0;
 326                 for (i = 0; i < nets; i++) {
 327                         baddr.sin_addr = addrs[i];
 328                         if (_sendto(sock, outbuf, outlen, 0,
 329                                 (struct sockaddr *)&baddr,
 330                                 sizeof (struct sockaddr)) == outlen) {
 331                                 success++;
 332                         }
 333                 }
 334                 if (!success) {
 335                         perror("Cannot send broadcast packet");
 336                         stat = RPC_CANTSEND;
 337                         goto done_broad;
 338                 }
 339                 if (eachresult == NULL) {
 340                         stat = RPC_SUCCESS;
 341                         goto done_broad;
 342                 }
 343         recv_again:
 344                 msg.acpted_rply.ar_verf = _null_auth;
 345                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 346                 msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
 347                 /* XXX we know the other bits are still clear */
 348                 FD_SET(sock, fds);
 349                 tv = t;         /* for _select() that copies back */
 350                 switch (_select(sock + 1, fds, NULL, NULL, &tv)) {
 351
 352                 case 0:  /* timed out */
 353                         stat = RPC_TIMEDOUT;
 354                         continue;
 355
 356                 case -1:  /* some kind of error */
 357                         if (errno == EINTR)
 358                                 goto recv_again;
 359                         perror("Broadcast select problem");
 360                         stat = RPC_CANTRECV;
 361                         goto done_broad;
 362
 363                 }  /* end of select results switch */
 364         try_again:
 365                 fromlen = sizeof(struct sockaddr);
 366                 inlen = _recvfrom(sock, inbuf, UDPMSGSIZE, 0,
 367                         (struct sockaddr *)&raddr, &fromlen);
 368                 if (inlen < 0) {
 369                         if (errno == EINTR)
 370                                 goto try_again;
 371                         perror("Cannot receive reply to broadcast");
 372                         stat = RPC_CANTRECV;
 373                         goto done_broad;
 374                 }
 375                 if (inlen < sizeof(u_int32_t))
 376                         goto recv_again;
 377                 /*
 378                  * see if reply transaction id matches sent id.
 379                  * If so, decode the results.
 380                  */
 381                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 382                 if (xdr_replymsg(xdrs, &msg)) {
 383                         if ((msg.rm_xid == xid) &&
 384                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 385                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 386                                 raddr.sin_port = htons((u_short)port);
 387                                 done = (*eachresult)(resultsp, &raddr);
 388                         }
 389                         /* otherwise, we just ignore the errors ... */
 390                 }
 391                 xdrs->x_op = XDR_FREE;
 392                 msg.acpted_rply.ar_results.proc = xdr_void;
 393                 xdr_replymsg(xdrs, &msg);
 394                 (*xresults)(xdrs, resultsp);
 395                 xdr_destroy(xdrs);
 396                 if (done) {
 397                         stat = RPC_SUCCESS;
 398                         goto done_broad;
 399                 } else {
 400                         goto recv_again;
 401                 }
 402         }
 403 done_broad:
 404         if (fds != &readfds)
 405                 free(fds);
 406         if (sock >= 0)
 407                 _close(sock);
 408         AUTH_DESTROY(unix_auth);
 409         return (stat);
 410 }
 411