nis/nis_callback.c

   1 /* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <rpc/rpc.h>
  25 #include <rpc/pmap_clnt.h>
  26 #include <string.h>
  27 #include <memory.h>
  28 #include <syslog.h>
  29 #include <sys/socket.h>
  30 #include <netinet/in.h>
  31 #include <arpa/inet.h>
  32 #include <rpc/key_prot.h>
  33 #include <rpcsvc/nis.h>
  34 #include <rpcsvc/nis_callback.h>
  35 #include <bits/libc-lock.h>
  36
  37 #include "nis_xdr.h"
  38 #include "nis_intern.h"
  39
  40 /* Sorry, we are not able to make this threadsafe. Stupid. But some
  41    functions doesn't send us a nis_result obj, so we don't have a
  42    cookie. Maybe we could use keys for threads ? Have to learn more
  43    about pthreads -- kukuk@vt.uni-paderborn.de */
  44
  45 static nis_cb *data;
  46
  47 __libc_lock_define_initialized (static, callback)
  48
  49
  50 #if 0
  51 static char *
  52 __nis_getpkey(const char *sname)
  53 {
  54   char buf[(strlen (sname) + 1) * 2 + 40];
  55   char pkey[HEXKEYBYTES + 1];
  56   char *cp, *domain;
  57   nis_result *res;
  58   u_int len = 0;
  59
  60   domain = strchr (sname, '.');
  61   if (domain == NULL)
  62     return NULL;
  63
  64   /* Remove prefixing dot */
  65   ++domain;
  66
  67   cp = stpcpy (buf, "[cname=");
  68   cp = stpcpy (cp, sname);
  69   cp = stpcpy (cp, ",auth_type=DES],cred.org_dir.");
  70   cp = stpcpy (cp, domain);
  71
  72   res = nis_list (buf, USE_DGRAM|NO_AUTHINFO|FOLLOW_LINKS|FOLLOW_PATH,
  73                   NULL, NULL);
  74
  75   if (res == NULL)
  76     return NULL;
  77
  78   if (NIS_RES_STATUS (res) != NIS_SUCCESS)
  79     {
  80       nis_freeresult (res);
  81       return NULL;
  82     }
  83
  84   len = ENTRY_LEN(NIS_RES_OBJECT(res), 3);
  85   strncpy (pkey, ENTRY_VAL(NIS_RES_OBJECT(res), 3), len);
  86   pkey[len] = '\0';
  87   cp = strchr (pkey, ':');
  88   if (cp != NULL)
  89     *cp = '\0';
  90
  91   nis_freeresult (res);
  92
  93   return strdup (pkey);
  94 }
  95 #endif
  96
  97 static void
  98 cb_prog_1 (struct svc_req *rqstp, SVCXPRT *transp)
  99 {
 100   union
 101     {
 102       cback_data cbproc_receive_1_arg;
 103       nis_error cbproc_error_1_arg;
 104     }
 105   argument;
 106   char *result;
 107   xdrproc_t xdr_argument, xdr_result;
 108   bool_t bool_result;
 109
 110   switch (rqstp->rq_proc)
 111     {
 112     case NULLPROC:
 113       svc_sendreply (transp, (xdrproc_t) xdr_void, (char *) NULL);
 114       return;
 115
 116     case CBPROC_RECEIVE:
 117       {
 118         u_long i;
 119
 120         xdr_argument = (xdrproc_t) xdr_cback_data;
 121         xdr_result = (xdrproc_t) xdr_bool;
 122         memset (&argument, 0, sizeof (argument));
 123         if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
 124           {
 125             svcerr_decode (transp);
 126             return;
 127           }
 128         bool_result = FALSE;
 129         for (i = 0; i < argument.cbproc_receive_1_arg.entries.entries_len; ++i)
 130           {
 131 #define cbproc_entry(a) argument.cbproc_receive_1_arg.entries.entries_val[a]
 132             char name[strlen (cbproc_entry(i)->zo_name) +
 133                       strlen (cbproc_entry(i)->zo_domain) + 3];
 134             char *cp;
 135
 136             cp = stpcpy (name, cbproc_entry(i)->zo_name);
 137             *cp++ = '.';
 138             cp = stpcpy (cp, cbproc_entry(i)->zo_domain);
 139
 140             if ((data->callback) (name, cbproc_entry(i), data->userdata))
 141               {
 142                 bool_result = TRUE;
 143                 data->nomore = 1;
 144                 data->result = NIS_SUCCESS;
 145                 break;
 146               }
 147           }
 148         result = (char *) &bool_result;
 149       }
 150       break;
 151     case CBPROC_FINISH:
 152       xdr_argument = (xdrproc_t) xdr_void;
 153       xdr_result = (xdrproc_t) xdr_void;
 154       memset (&argument, 0, sizeof (argument));
 155       if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
 156         {
 157           svcerr_decode (transp);
 158           return;
 159         }
 160       data->nomore = 1;
 161       data->result = NIS_SUCCESS;
 162       bool_result = TRUE;       /* to make gcc happy, not necessary */
 163       result = (char *) &bool_result;
 164       break;
 165     case CBPROC_ERROR:
 166       xdr_argument = (xdrproc_t) _xdr_nis_error;
 167       xdr_result = (xdrproc_t) xdr_void;
 168       memset (&argument, 0, sizeof (argument));
 169       if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
 170         {
 171           svcerr_decode (transp);
 172           return;
 173         }
 174       data->nomore = 1;
 175       data->result = argument.cbproc_error_1_arg;
 176       bool_result = TRUE;       /* to make gcc happy, not necessary */
 177       result = (char *) &bool_result;
 178       break;
 179     default:
 180       svcerr_noproc (transp);
 181       return;
 182     }
 183   if (result != NULL && !svc_sendreply (transp, xdr_result, result))
 184     svcerr_systemerr (transp);
 185   if (!svc_freeargs (transp, xdr_argument, (caddr_t) & argument))
 186     {
 187       fputs (_ ("unable to free arguments"), stderr);
 188       exit (1);
 189     }
 190   return;
 191 }
 192
 193 static nis_error
 194 internal_nis_do_callback (struct dir_binding *bptr, netobj *cookie,
 195                           struct nis_cb *cb)
 196 {
 197   /* Default timeout can be changed using clnt_control() */
 198   static struct timeval TIMEOUT = {25, 0};
 199 #ifdef FD_SETSIZE
 200   fd_set readfds;
 201 #else
 202   int readfds;
 203 #endif /* def FD_SETSIZE */
 204   struct timeval tv;
 205   bool_t cb_is_running = FALSE;
 206
 207   data = cb;
 208
 209   for (;;)
 210     {
 211 #ifdef FD_SETSIZE
 212       readfds = svc_fdset;
 213 #else
 214       readfds = svc_fds;
 215 #endif /* def FD_SETSIZE */
 216       tv.tv_sec = 25;
 217       tv.tv_usec = 0;
 218       switch (select (_rpc_dtablesize (), &readfds, NULL, NULL, &tv))
 219         {
 220         case -1:
 221           if (errno == EINTR)
 222             continue;
 223           return NIS_CBERROR;
 224         case 0:
 225           /* See if callback 'thread' in the server is still alive. */
 226           memset ((char *) &cb_is_running, 0, sizeof (cb_is_running));
 227           if (clnt_call (bptr->clnt, NIS_CALLBACK, (xdrproc_t) xdr_netobj,
 228                          (caddr_t) cookie, (xdrproc_t) xdr_bool,
 229                          (caddr_t) & cb_is_running, TIMEOUT) != RPC_SUCCESS)
 230             cb_is_running = FALSE;
 231
 232           if (cb_is_running == FALSE)
 233             {
 234               syslog (LOG_ERR, "NIS+: callback timed out");
 235               return NIS_CBERROR;
 236             }
 237           break;
 238         default:
 239           svc_getreqset (&readfds);
 240           if (data->nomore)
 241             return data->result;
 242         }
 243     }
 244 }
 245
 246 nis_error
 247 __nis_do_callback (struct dir_binding *bptr, netobj *cookie,
 248                    struct nis_cb *cb)
 249 {
 250   nis_error result;
 251
 252   __libc_lock_lock (callback);
 253
 254   result = internal_nis_do_callback (bptr, cookie, cb);
 255
 256   __libc_lock_unlock (callback);
 257
 258   return result;
 259 }
 260
 261 struct nis_cb *
 262 __nis_create_callback (int (*callback) (const_nis_name, const nis_object *,
 263                                         const void *),
 264                        const void *userdata, u_long flags)
 265 {
 266   struct nis_cb *cb;
 267   int sock = RPC_ANYSOCK;
 268   struct sockaddr_in sin;
 269   int len = sizeof (struct sockaddr_in);
 270   char addr[NIS_MAXNAMELEN + 1];
 271   unsigned short port;
 272
 273   cb = (struct nis_cb *) calloc (1, sizeof (struct nis_cb));
 274   if (cb == NULL)
 275     {
 276       syslog (LOG_ERR, "NIS+: out of memory allocating callback");
 277       return NULL;
 278     }
 279
 280   cb->serv = (nis_server *) calloc (1, sizeof (nis_server));
 281   if (cb->serv == NULL)
 282     {
 283       free (cb);
 284       syslog (LOG_ERR, "NIS+: out of memory allocating callback");
 285       return NULL;
 286     }
 287   cb->serv->name = strdup (nis_local_principal ());
 288   cb->serv->ep.ep_val = (endpoint *) calloc (2, sizeof (endpoint));
 289   cb->serv->ep.ep_len = 1;
 290   cb->serv->ep.ep_val[0].family = strdup ("inet");
 291   cb->callback = callback;
 292   cb->userdata = userdata;
 293
 294   if ((flags & NO_AUTHINFO) || !key_secretkey_is_set ())
 295     {
 296       cb->serv->key_type = NIS_PK_NONE;
 297       cb->serv->pkey.n_bytes = NULL;
 298       cb->serv->pkey.n_len = 0;
 299     }
 300   else
 301     {
 302 #if 0
 303       if ((cb->serv->pkey.n_bytes = __nis_getpkey (cb->serv->name)) == NULL)
 304         {
 305           cb->serv->pkey.n_len = 0;
 306           cb->serv->key_type = NIS_PK_NONE;
 307         }
 308       else
 309         {
 310           cb->serv->key_type = NIS_PK_DH;
 311           cb->serv->pkey.n_len = strlen(cb->serv->pkey.n_bytes);
 312         }
 313 #else
 314       cb->serv->pkey.n_len =0;
 315       cb->serv->pkey.n_bytes = NULL;
 316       cb->serv->key_type = NIS_PK_NONE;
 317 #endif
 318     }
 319
 320   if (flags & USE_DGRAM)
 321     {
 322       cb->serv->ep.ep_val[0].proto = strdup ("udp");
 323       cb->xprt = svcudp_bufcreate (sock, 100, 8192);
 324     }
 325   else
 326     {
 327       cb->serv->ep.ep_val[0].proto = strdup ("tcp");
 328       cb->xprt = svctcp_create (sock, 100, 8192);
 329     }
 330   cb->sock = cb->xprt->xp_sock;
 331   if (!svc_register (cb->xprt, CB_PROG, CB_VERS, cb_prog_1, 0))
 332     {
 333       xprt_unregister (cb->xprt);
 334       svc_destroy (cb->xprt);
 335       xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
 336       free (cb->serv);
 337       free (cb);
 338       syslog (LOG_ERR, "NIS+: failed to register callback dispatcher");
 339       return NULL;
 340     }
 341
 342   if (getsockname (cb->sock, (struct sockaddr *) &sin, &len) == -1)
 343     {
 344       xprt_unregister (cb->xprt);
 345       svc_destroy (cb->xprt);
 346       xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
 347       free (cb->serv);
 348       free (cb);
 349       syslog (LOG_ERR, "NIS+: failed to read local socket info");
 350       return NULL;
 351     }
 352   port = sin.sin_port;
 353   get_myaddress (&sin);
 354   snprintf (addr, sizeof (addr), "%s.%d.%d", inet_ntoa (sin.sin_addr),
 355             port & 0x00FF, (port & 0xFF00) >> 8);
 356   cb->serv->ep.ep_val[0].uaddr = strdup (addr);
 357
 358   return cb;
 359 }
 360
 361 nis_error
 362 __nis_destroy_callback (struct nis_cb *cb)
 363 {
 364   xprt_unregister (cb->xprt);
 365   svc_destroy (cb->xprt);
 366   close (cb->sock);
 367   xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
 368   free (cb->serv);
 369   free (cb);
 370
 371   return NIS_SUCCESS;
 372 }