nis/nis_callback.c

   1 /* Copyright (C) 1997,1998,1999,2000,2005,2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <libintl.h>
  25 #include <rpc/rpc.h>
  26 #include <rpc/pmap_clnt.h>
  27 #include <string.h>
  28 #include <memory.h>
  29 #include <syslog.h>
  30 #include <sys/poll.h>
  31 #include <sys/socket.h>
  32 #include <netinet/in.h>
  33 #include <arpa/inet.h>
  34 #include <rpc/key_prot.h>
  35 #include <rpcsvc/nis.h>
  36 #include <rpcsvc/nis_callback.h>
  37 #include <bits/libc-lock.h>
  38
  39 #include "nis_xdr.h"
  40 #include "nis_intern.h"
  41
  42 /* Sorry, we are not able to make this threadsafe. Stupid. But some
  43    functions doesn't send us a nis_result obj, so we don't have a
  44    cookie. Maybe we could use keys for threads ? Have to learn more
  45    about pthreads -- kukuk@vt.uni-paderborn.de */
  46
  47 static nis_cb *data;
  48
  49 __libc_lock_define_initialized (static, callback)
  50
  51
  52 #if 0
  53 static char *
  54 __nis_getpkey(const char *sname)
  55 {
  56   char buf[(strlen (sname) + 1) * 2 + 40];
  57   char pkey[HEXKEYBYTES + 1];
  58   char *cp, *domain;
  59   nis_result *res;
  60   unsigned int len = 0;
  61
  62   domain = strchr (sname, '.');
  63   if (domain == NULL)
  64     return NULL;
  65
  66   /* Remove prefixing dot */
  67   ++domain;
  68
  69   cp = stpcpy (buf, "[cname=");
  70   cp = stpcpy (cp, sname);
  71   cp = stpcpy (cp, ",auth_type=DES],cred.org_dir.");
  72   cp = stpcpy (cp, domain);
  73
  74   res = nis_list (buf, USE_DGRAM|NO_AUTHINFO|FOLLOW_LINKS|FOLLOW_PATH,
  75                   NULL, NULL);
  76
  77   if (res == NULL)
  78     return NULL;
  79
  80   if (NIS_RES_STATUS (res) != NIS_SUCCESS)
  81     {
  82       nis_freeresult (res);
  83       return NULL;
  84     }
  85
  86   len = ENTRY_LEN(NIS_RES_OBJECT(res), 3);
  87   strncpy (pkey, ENTRY_VAL(NIS_RES_OBJECT(res), 3), len);
  88   pkey[len] = '\0';
  89   cp = strchr (pkey, ':');
  90   if (cp != NULL)
  91     *cp = '\0';
  92
  93   nis_freeresult (res);
  94
  95   return strdup (pkey);
  96 }
  97 #endif
  98
  99 static void
 100 cb_prog_1 (struct svc_req *rqstp, SVCXPRT *transp)
 101 {
 102   union
 103     {
 104       cback_data cbproc_receive_1_arg;
 105       nis_error cbproc_error_1_arg;
 106     }
 107   argument;
 108   char *result;
 109   xdrproc_t xdr_argument, xdr_result;
 110   bool_t bool_result;
 111
 112   switch (rqstp->rq_proc)
 113     {
 114     case NULLPROC:
 115       svc_sendreply (transp, (xdrproc_t) xdr_void, (char *) NULL);
 116       return;
 117
 118     case CBPROC_RECEIVE:
 119       {
 120         unsigned int i;
 121
 122         xdr_argument = (xdrproc_t) xdr_cback_data;
 123         xdr_result = (xdrproc_t) xdr_bool;
 124         memset (&argument, 0, sizeof (argument));
 125         if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
 126           {
 127             svcerr_decode (transp);
 128             return;
 129           }
 130         bool_result = FALSE;
 131         for (i = 0; i < argument.cbproc_receive_1_arg.entries.entries_len; ++i)
 132           {
 133 #define cbproc_entry(a) argument.cbproc_receive_1_arg.entries.entries_val[a]
 134             char name[strlen (cbproc_entry(i)->zo_name) +
 135                       strlen (cbproc_entry(i)->zo_domain) + 3];
 136             char *cp;
 137
 138             cp = stpcpy (name, cbproc_entry(i)->zo_name);
 139             *cp++ = '.';
 140             cp = stpcpy (cp, cbproc_entry(i)->zo_domain);
 141
 142             if ((data->callback) (name, cbproc_entry(i), data->userdata))
 143               {
 144                 bool_result = TRUE;
 145                 data->nomore = 1;
 146                 data->result = NIS_SUCCESS;
 147                 break;
 148               }
 149           }
 150         result = (char *) &bool_result;
 151       }
 152       break;
 153     case CBPROC_FINISH:
 154       xdr_argument = (xdrproc_t) xdr_void;
 155       xdr_result = (xdrproc_t) xdr_void;
 156       memset (&argument, 0, sizeof (argument));
 157       if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
 158         {
 159           svcerr_decode (transp);
 160           return;
 161         }
 162       data->nomore = 1;
 163       data->result = NIS_SUCCESS;
 164       bool_result = TRUE;       /* to make gcc happy, not necessary */
 165       result = (char *) &bool_result;
 166       break;
 167     case CBPROC_ERROR:
 168       xdr_argument = (xdrproc_t) _xdr_nis_error;
 169       xdr_result = (xdrproc_t) xdr_void;
 170       memset (&argument, 0, sizeof (argument));
 171       if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
 172         {
 173           svcerr_decode (transp);
 174           return;
 175         }
 176       data->nomore = 1;
 177       data->result = argument.cbproc_error_1_arg;
 178       bool_result = TRUE;       /* to make gcc happy, not necessary */
 179       result = (char *) &bool_result;
 180       break;
 181     default:
 182       svcerr_noproc (transp);
 183       return;
 184     }
 185   if (result != NULL && !svc_sendreply (transp, xdr_result, result))
 186     svcerr_systemerr (transp);
 187   if (!svc_freeargs (transp, xdr_argument, (caddr_t) & argument))
 188     {
 189       fputs (_ ("unable to free arguments"), stderr);
 190       exit (1);
 191     }
 192   return;
 193 }
 194
 195 static nis_error
 196 internal_nis_do_callback (struct dir_binding *bptr, netobj *cookie,
 197                           struct nis_cb *cb)
 198 {
 199   struct timeval TIMEOUT = {25, 0};
 200   bool_t cb_is_running;
 201
 202   data = cb;
 203
 204   for (;;)
 205     {
 206       struct pollfd my_pollfd[svc_max_pollfd];
 207       int i;
 208
 209       if (svc_max_pollfd == 0 && svc_pollfd == NULL)
 210         return NIS_CBERROR;
 211
 212       for (i = 0; i < svc_max_pollfd; ++i)
 213         {
 214           my_pollfd[i].fd = svc_pollfd[i].fd;
 215           my_pollfd[i].events = svc_pollfd[i].events;
 216           my_pollfd[i].revents = 0;
 217         }
 218
 219       switch (i = TEMP_FAILURE_RETRY (__poll (my_pollfd, svc_max_pollfd,
 220                                               25*1000)))
 221         {
 222         case -1:
 223           return NIS_CBERROR;
 224         case 0:
 225           /* See if callback 'thread' in the server is still alive. */
 226           cb_is_running = FALSE;
 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_getreq_poll (my_pollfd, i);
 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, unsigned int flags)
 265 {
 266   struct nis_cb *cb;
 267   int sock = RPC_ANYSOCK;
 268   struct sockaddr_in sin;
 269   socklen_t len = sizeof (struct sockaddr_in);
 270   unsigned short port;
 271   int nomsg = 0;
 272
 273   cb = (struct nis_cb *) calloc (1,
 274                                  sizeof (struct nis_cb) + sizeof (nis_server));
 275   if (__builtin_expect (cb == NULL, 0))
 276     goto failed;
 277   cb->serv = (nis_server *) (cb + 1);
 278   cb->serv->name = strdup (nis_local_principal ());
 279   if (__builtin_expect (cb->serv->name == NULL, 0))
 280     goto failed;
 281   cb->serv->ep.ep_val = (endpoint *) calloc (2, sizeof (endpoint));
 282   if (__builtin_expect (cb->serv->ep.ep_val == NULL, 0))
 283     goto failed;
 284   cb->serv->ep.ep_len = 1;
 285   cb->serv->ep.ep_val[0].family = strdup ("inet");
 286   if (__builtin_expect (cb->serv->ep.ep_val[0].family == NULL, 0))
 287     goto failed;
 288   cb->callback = callback;
 289   cb->userdata = userdata;
 290
 291   if ((flags & NO_AUTHINFO) || !key_secretkey_is_set ())
 292     {
 293       cb->serv->key_type = NIS_PK_NONE;
 294       cb->serv->pkey.n_bytes = NULL;
 295       cb->serv->pkey.n_len = 0;
 296     }
 297   else
 298     {
 299 #if 0
 300       if ((cb->serv->pkey.n_bytes = __nis_getpkey (cb->serv->name)) == NULL)
 301         {
 302           cb->serv->pkey.n_len = 0;
 303           cb->serv->key_type = NIS_PK_NONE;
 304         }
 305       else
 306         {
 307           cb->serv->key_type = NIS_PK_DH;
 308           cb->serv->pkey.n_len = strlen(cb->serv->pkey.n_bytes);
 309         }
 310 #else
 311       cb->serv->pkey.n_len =0;
 312       cb->serv->pkey.n_bytes = NULL;
 313       cb->serv->key_type = NIS_PK_NONE;
 314 #endif
 315     }
 316
 317   cb->serv->ep.ep_val[0].proto = strdup ((flags & USE_DGRAM) ? "udp" : "tcp");
 318   if (__builtin_expect (cb->serv->ep.ep_val[0].proto == NULL, 0))
 319     goto failed;
 320   cb->xprt = ((flags & USE_DGRAM)
 321               ? svcudp_bufcreate (sock, 100, 8192)
 322               : svctcp_create (sock, 100, 8192));
 323   if (cb->xprt == NULL)
 324     {
 325       nomsg = 1;
 326       goto failed;
 327     }
 328   cb->sock = cb->xprt->xp_sock;
 329   if (!svc_register (cb->xprt, CB_PROG, CB_VERS, cb_prog_1, 0))
 330     {
 331       xprt_unregister (cb->xprt);
 332       svc_destroy (cb->xprt);
 333       xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
 334       free (cb);
 335       syslog (LOG_ERR, "NIS+: failed to register callback dispatcher");
 336       return NULL;
 337     }
 338
 339   if (getsockname (cb->sock, (struct sockaddr *) &sin, &len) == -1)
 340     {
 341       xprt_unregister (cb->xprt);
 342       svc_destroy (cb->xprt);
 343       xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
 344       free (cb);
 345       syslog (LOG_ERR, "NIS+: failed to read local socket info");
 346       return NULL;
 347     }
 348   port = ntohs (sin.sin_port);
 349   get_myaddress (&sin);
 350
 351   if (asprintf (&cb->serv->ep.ep_val[0].uaddr, "%s.%d.%d",
 352                 inet_ntoa (sin.sin_addr), (port & 0xFF00) >> 8, port & 0x00FF)
 353       < 0)
 354     goto failed;
 355
 356   return cb;
 357
 358  failed:
 359   if (cb)
 360     {
 361       if (cb->xprt)
 362         svc_destroy (cb->xprt);
 363       xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
 364       free (cb);
 365     }
 366   if (!nomsg)
 367     syslog (LOG_ERR, "NIS+: out of memory allocating callback");
 368   return NULL;
 369 }
 370
 371 nis_error
 372 __nis_destroy_callback (struct nis_cb *cb)
 373 {
 374   xprt_unregister (cb->xprt);
 375   svc_destroy (cb->xprt);
 376   close (cb->sock);
 377   xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
 378   free (cb);
 379
 380   return NIS_SUCCESS;
 381 }