hurd/hurdmsg.c

   1 /* Copyright (C) 1992-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <hurd.h>
  19 #include <hurd/msg_server.h>
  20 #include <hurd/fd.h>
  21 #include <unistd.h>
  22 #include <limits.h>
  23 #include <string.h>
  24 #include <argz.h>
  25
  26
  27 #define AUTHCHECK \
  28   if (auth != mach_task_self () && ! __USEPORT (AUTH, port == auth)) \
  29     return EPERM
  30
  31
  32 /* Snarfing and frobbing the init ports.  */
  33
  34 kern_return_t
  35   _S_msg_get_init_port (mach_port_t msgport, mach_port_t auth, int which,
  36                         mach_port_t *result, mach_msg_type_name_t *result_type)
  37 {
  38   AUTHCHECK;
  39   *result_type = MACH_MSG_TYPE_MOVE_SEND;
  40   /* This function adds a new user reference for the *RESULT it gives back.
  41      Our reply message uses a move-send right that consumes this reference.  */
  42   return _hurd_ports_get (which, result);
  43 }
  44
  45 kern_return_t
  46 _S_msg_set_init_port (mach_port_t msgport, mach_port_t auth,
  47                       int which, mach_port_t port)
  48 {
  49   error_t err;
  50
  51   AUTHCHECK;
  52
  53   err = _hurd_ports_set (which, port);
  54   if (err == 0)
  55     __mach_port_deallocate (__mach_task_self (), port);
  56
  57   return 0;
  58 }
  59
  60 kern_return_t
  61 _S_msg_get_init_ports (mach_port_t msgport, mach_port_t auth,
  62                        mach_port_t **ports,
  63                        mach_msg_type_name_t *ports_type,
  64                        mach_msg_type_number_t *nports)
  65 {
  66   mach_msg_type_number_t i;
  67   error_t err;
  68
  69   AUTHCHECK;
  70
  71   if (err = __vm_allocate (__mach_task_self (), (vm_address_t *) ports,
  72                            _hurd_nports * sizeof (mach_port_t), 1))
  73     return err;
  74   *nports = _hurd_nports;
  75
  76   for (i = 0; i < _hurd_nports; ++i)
  77     /* This function adds a new user ref for the *RESULT it gives back.
  78        Our reply message uses move-send rights that consumes this ref.  */
  79     if (err = _hurd_ports_get (i, &(*ports)[i]))
  80       {
  81         /* Died part way through.  Deallocate the ports already fetched.  */
  82         while (i-- > 0)
  83           __mach_port_deallocate (__mach_task_self (), (*ports)[i]);
  84         __vm_deallocate (__mach_task_self (),
  85                          (vm_address_t) *ports,
  86                          *nports * sizeof (mach_port_t));
  87         return err;
  88       }
  89
  90   *ports_type = MACH_MSG_TYPE_MOVE_SEND;
  91   return 0;
  92 }
  93
  94 kern_return_t
  95 _S_msg_set_init_ports (mach_port_t msgport, mach_port_t auth,
  96                        mach_port_t *ports, mach_msg_type_number_t nports)
  97 {
  98   mach_msg_type_number_t i;
  99   error_t err;
 100
 101   AUTHCHECK;
 102
 103   for (i = 0; i < _hurd_nports; ++i)
 104     {
 105       if (err = _hurd_ports_set (i, ports[i]))
 106         return err;
 107       else
 108         __mach_port_deallocate (__mach_task_self (), ports[i]);
 109     }
 110
 111   return 0;
 112 }
 113 \f
 114 /* Snarfing and frobbing the init ints.  */
 115
 116 static kern_return_t
 117 get_int (int which, int *value)
 118 {
 119   switch (which)
 120     {
 121     case INIT_UMASK:
 122       *value = _hurd_umask;
 123       return 0;
 124     case INIT_SIGMASK:
 125       {
 126         struct hurd_sigstate *ss = _hurd_thread_sigstate (_hurd_sigthread);
 127         __spin_lock (&ss->lock);
 128         *value = ss->blocked;
 129         __spin_unlock (&ss->lock);
 130         return 0;
 131       }
 132     case INIT_SIGPENDING:
 133       {
 134         struct hurd_sigstate *ss = _hurd_thread_sigstate (_hurd_sigthread);
 135         __spin_lock (&ss->lock);
 136         *value = ss->pending;
 137         __spin_unlock (&ss->lock);
 138         return 0;
 139       }
 140     case INIT_SIGIGN:
 141       {
 142         struct hurd_sigstate *ss = _hurd_thread_sigstate (_hurd_sigthread);
 143         sigset_t ign;
 144         int sig;
 145         __spin_lock (&ss->lock);
 146         __sigemptyset (&ign);
 147         for (sig = 1; sig < NSIG; ++sig)
 148           if (ss->actions[sig].sa_handler == SIG_IGN)
 149             __sigaddset (&ign, sig);
 150         __spin_unlock (&ss->lock);
 151         *value = ign;
 152         return 0;
 153       }
 154     default:
 155       return EINVAL;
 156     }
 157 }
 158
 159 kern_return_t
 160 _S_msg_get_init_int (mach_port_t msgport, mach_port_t auth,
 161                      int which, int *value)
 162 {
 163   AUTHCHECK;
 164
 165   return get_int (which, value);
 166 }
 167
 168 kern_return_t
 169 _S_msg_get_init_ints (mach_port_t msgport, mach_port_t auth,
 170                       int **values, mach_msg_type_number_t *nvalues)
 171 {
 172   error_t err;
 173   mach_msg_type_number_t i;
 174
 175   AUTHCHECK;
 176
 177   if (err = __vm_allocate (__mach_task_self (), (vm_address_t *) values,
 178                            INIT_INT_MAX * sizeof (int), 1))
 179     return err;
 180   *nvalues = INIT_INT_MAX;
 181
 182   for (i = 0; i < INIT_INT_MAX; ++i)
 183     switch (err = get_int (i, &(*values)[i]))
 184       {
 185       case 0:                   /* Success.  */
 186         break;
 187       case EINVAL:              /* Unknown index.  */
 188         (*values)[i] = 0;
 189         break;
 190       default:                  /* Lossage.  */
 191         __vm_deallocate (__mach_task_self (),
 192                          (vm_address_t) *values, INIT_INT_MAX * sizeof (int));
 193         return err;
 194       }
 195
 196   return 0;
 197 }
 198
 199
 200 static kern_return_t
 201 set_int (int which, int value)
 202 {
 203   switch (which)
 204     {
 205     case INIT_UMASK:
 206       _hurd_umask = value;
 207       return 0;
 208
 209       /* These are pretty odd things to do.  But you asked for it.  */
 210     case INIT_SIGMASK:
 211       {
 212         struct hurd_sigstate *ss = _hurd_thread_sigstate (_hurd_sigthread);
 213         __spin_lock (&ss->lock);
 214         ss->blocked = value;
 215         __spin_unlock (&ss->lock);
 216         return 0;
 217       }
 218     case INIT_SIGPENDING:
 219       {
 220         struct hurd_sigstate *ss = _hurd_thread_sigstate (_hurd_sigthread);
 221         __spin_lock (&ss->lock);
 222         ss->pending = value;
 223         __spin_unlock (&ss->lock);
 224         return 0;
 225       }
 226     case INIT_SIGIGN:
 227       {
 228         struct hurd_sigstate *ss = _hurd_thread_sigstate (_hurd_sigthread);
 229         int sig;
 230         const sigset_t ign = value;
 231         __spin_lock (&ss->lock);
 232         for (sig = 1; sig < NSIG; ++sig)
 233           {
 234             if (__sigismember (&ign, sig))
 235               ss->actions[sig].sa_handler = SIG_IGN;
 236             else if (ss->actions[sig].sa_handler == SIG_IGN)
 237               ss->actions[sig].sa_handler = SIG_DFL;
 238           }
 239         __spin_unlock (&ss->lock);
 240         return 0;
 241
 242       case INIT_TRACEMASK:
 243         _hurdsig_traced = value;
 244         return 0;
 245       }
 246     default:
 247       return EINVAL;
 248     }
 249 }
 250
 251 kern_return_t
 252 _S_msg_set_init_int (mach_port_t msgport, mach_port_t auth,
 253                      int which, int value)
 254 {
 255   AUTHCHECK;
 256
 257   return set_int (which, value);
 258 }
 259
 260 kern_return_t
 261 _S_msg_set_init_ints (mach_port_t msgport, mach_port_t auth,
 262                       int *values, mach_msg_type_number_t nvalues)
 263 {
 264   error_t err;
 265   mach_msg_type_number_t i;
 266
 267   AUTHCHECK;
 268
 269   for (i = 0; i < INIT_INT_MAX; ++i)
 270     switch (err = set_int (i, values[i]))
 271       {
 272       case 0:                   /* Success.  */
 273         break;
 274       case EINVAL:              /* Unknown index.  */
 275         break;
 276       default:                  /* Lossage.  */
 277         return err;
 278       }
 279
 280   return 0;
 281 }
 282 \f
 283
 284 kern_return_t
 285 _S_msg_get_fd (mach_port_t msgport, mach_port_t auth, int which,
 286                mach_port_t *result, mach_msg_type_name_t *result_type)
 287 {
 288   AUTHCHECK;
 289
 290   /* This creates a new user reference for the send right.
 291      Our reply message will move that reference to the caller.  */
 292   *result = __getdport (which);
 293   if (*result == MACH_PORT_NULL)
 294     return errno;
 295   *result_type = MACH_MSG_TYPE_MOVE_SEND;
 296
 297   return 0;
 298 }
 299
 300 kern_return_t
 301 _S_msg_set_fd (mach_port_t msgport, mach_port_t auth,
 302                int which, mach_port_t port)
 303 {
 304   AUTHCHECK;
 305
 306   /* We consume the reference if successful.  */
 307   return HURD_FD_USE (which, (_hurd_port2fd (descriptor, port, 0), 0));
 308 }
 309 \f
 310 /* Snarfing and frobbing environment variables.  */
 311
 312 kern_return_t
 313 _S_msg_get_env_variable (mach_port_t msgport,
 314                          char *variable,
 315                          char **data, mach_msg_type_number_t *datalen)
 316 {
 317   error_t err;
 318   mach_msg_type_number_t valuelen;
 319   const char *value = getenv (variable);
 320
 321   if (value == NULL)
 322     return ENOENT;
 323
 324   valuelen = strlen (value);
 325   if (valuelen > *datalen)
 326     {
 327       if (err = __vm_allocate (__mach_task_self (),
 328                                (vm_address_t *) data, valuelen, 1))
 329         return err;
 330     }
 331
 332   memcpy (*data, value, valuelen);
 333   *datalen = valuelen;
 334
 335   return 0;
 336 }
 337
 338
 339 kern_return_t
 340 _S_msg_set_env_variable (mach_port_t msgport, mach_port_t auth,
 341                          char *variable,
 342                          char *value,
 343                          int replace)
 344 {
 345   AUTHCHECK;
 346
 347   if (setenv (variable, value, replace)) /* XXX name space */
 348     return errno;
 349   return 0;
 350 }
 351
 352 kern_return_t
 353 _S_msg_get_environment (mach_port_t msgport,
 354                         char **data, mach_msg_type_number_t *datalen)
 355 {
 356   /* Pack the environment into an array with nulls separating elements.  */
 357   if (__environ != NULL)
 358     {
 359       char *ap, **p;
 360       size_t envlen = 0;
 361
 362       for (p = __environ; *p != NULL; ++p)
 363         envlen += strlen (*p) + 1;
 364
 365       if (envlen > *datalen)
 366         {
 367           if (__vm_allocate (__mach_task_self (),
 368                              (vm_address_t *) data, envlen, 1))
 369             return ENOMEM;
 370         }
 371
 372       ap = *data;
 373       for (p = __environ; *p != NULL; ++p)
 374         ap = __memccpy (ap, *p, '\0', ULONG_MAX);
 375
 376       *datalen = envlen;
 377     }
 378   else
 379     *datalen = 0;
 380
 381   return 0;
 382 }
 383
 384 kern_return_t
 385 _S_msg_set_environment (mach_port_t msgport, mach_port_t auth,
 386                         char *data, mach_msg_type_number_t datalen)
 387 {
 388   int _hurd_split_args (char *, mach_msg_type_number_t, char **);
 389   int envc;
 390   char **envp;
 391
 392   AUTHCHECK;
 393
 394   envc = __argz_count (data, datalen);
 395   envp = malloc ((envc + 1) * sizeof (char *));
 396   if (envp == NULL)
 397     return errno;
 398   __argz_extract (data, datalen, envp);
 399   __environ = envp;             /* XXX cooperate with loadenv et al */
 400   return 0;
 401 }
 402 \f
 403
 404 /* XXX */
 405
 406 kern_return_t
 407 _S_msg_get_dtable (mach_port_t process,
 408                    mach_port_t refport,
 409                    portarray_t *dtable,
 410                    mach_msg_type_name_t *dtablePoly,
 411                    mach_msg_type_number_t *dtableCnt)
 412 { return EOPNOTSUPP; }
 413
 414 kern_return_t
 415 _S_msg_set_dtable (mach_port_t process,
 416                    mach_port_t refport,
 417                    portarray_t dtable,
 418                    mach_msg_type_number_t dtableCnt)
 419 { return EOPNOTSUPP; }