source3/libsmb/libsmb_context.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SMB client library implementation
   4    Copyright (C) Andrew Tridgell 1998
   5    Copyright (C) Richard Sharpe 2000, 2002
   6    Copyright (C) John Terpstra 2000
   7    Copyright (C) Tom Jansen (Ninja ISD) 2002
   8    Copyright (C) Derrell Lipman 2003-2008
   9    Copyright (C) Jeremy Allison 2007, 2008
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "libsmb/libsmb.h"
  27 #include "libsmbclient.h"
  28 #include "libsmb_internal.h"
  29 #include "secrets.h"
  30 #include "../libcli/smb/smbXcli_base.h"
  31
  32 /*
  33  * Is the logging working / configfile read ?
  34  */
  35 static bool SMBC_initialized = false;
  36 static unsigned int initialized_ctx_count = 0;
  37 static void *initialized_ctx_count_mutex = NULL;
  38
  39 /*
  40  * Do some module- and library-wide intializations
  41  */
  42 static void
  43 SMBC_module_init(void * punused)
  44 {
  45     bool conf_loaded = False;
  46     char *home = NULL;
  47     TALLOC_CTX *frame = talloc_stackframe();
  48
  49     setup_logging("libsmbclient", DEBUG_STDOUT);
  50
  51     /* Here we would open the smb.conf file if needed ... */
  52
  53     home = getenv("HOME");
  54     if (home) {
  55         char *conf = NULL;
  56         if (asprintf(&conf, "%s/.smb/smb.conf", home) > 0) {
  57             if (lp_load_client(conf)) {
  58                 conf_loaded = True;
  59             } else {
  60                 DEBUG(5, ("Could not load config file: %s\n",
  61                           conf));
  62             }
  63             SAFE_FREE(conf);
  64         }
  65     }
  66
  67     if (!conf_loaded) {
  68         /*
  69          * Well, if that failed, try the get_dyn_CONFIGFILE
  70          * Which points to the standard locn, and if that
  71          * fails, silently ignore it and use the internal
  72          * defaults ...
  73          */
  74
  75         if (!lp_load_client(get_dyn_CONFIGFILE())) {
  76             DEBUG(5, ("Could not load config file: %s\n",
  77                       get_dyn_CONFIGFILE()));
  78         } else if (home) {
  79             char *conf;
  80             /*
  81              * We loaded the global config file.  Now lets
  82              * load user-specific modifications to the
  83              * global config.
  84              */
  85             if (asprintf(&conf,
  86                          "%s/.smb/smb.conf.append",
  87                          home) > 0) {
  88                 if (!lp_load_client_no_reinit(conf)) {
  89                     DEBUG(10,
  90                           ("Could not append config file: "
  91                            "%s\n",
  92                            conf));
  93                 }
  94                 SAFE_FREE(conf);
  95             }
  96         }
  97     }
  98
  99     load_interfaces();  /* Load the list of interfaces ... */
 100
 101     reopen_logs();  /* Get logging working ... */
 102
 103     /*
 104      * Block SIGPIPE (from lib/util_sock.c: write())
 105      * It is not needed and should not stop execution
 106      */
 107     BlockSignals(True, SIGPIPE);
 108
 109     /* Create the mutex we'll use to protect initialized_ctx_count */
 110     if (SMB_THREAD_CREATE_MUTEX("initialized_ctx_count_mutex",
 111                                 initialized_ctx_count_mutex) != 0) {
 112         smb_panic("SMBC_module_init: "
 113                   "failed to create 'initialized_ctx_count' mutex");
 114     }
 115
 116
 117     TALLOC_FREE(frame);
 118 }
 119
 120
 121 static void
 122 SMBC_module_terminate(void)
 123 {
 124     TALLOC_CTX *frame = talloc_stackframe();
 125     secrets_shutdown();
 126     gfree_all();
 127     SMBC_initialized = false;
 128     TALLOC_FREE(frame);
 129 }
 130
 131
 132 /*
 133  * Get a new empty handle to fill in with your own info
 134  */
 135 SMBCCTX *
 136 smbc_new_context(void)
 137 {
 138         SMBCCTX *context;
 139         TALLOC_CTX *frame = talloc_stackframe();
 140
 141         /* The first call to this function should initialize the module */
 142         SMB_THREAD_ONCE(&SMBC_initialized, SMBC_module_init, NULL);
 143
 144         /*
 145          * All newly added context fields should be placed in
 146          * SMBC_internal_data, not directly in SMBCCTX.
 147          */
 148         context = SMB_MALLOC_P(SMBCCTX);
 149         if (!context) {
 150                 TALLOC_FREE(frame);
 151                 errno = ENOMEM;
 152                 return NULL;
 153         }
 154
 155         ZERO_STRUCTP(context);
 156
 157         context->internal = SMB_MALLOC_P(struct SMBC_internal_data);
 158         if (!context->internal) {
 159                 TALLOC_FREE(frame);
 160                 SAFE_FREE(context);
 161                 errno = ENOMEM;
 162                 return NULL;
 163         }
 164
 165         /* Initialize the context and establish reasonable defaults */
 166         ZERO_STRUCTP(context->internal);
 167
 168         smbc_setDebug(context, 0);
 169         smbc_setTimeout(context, 20000);
 170         smbc_setPort(context, 0);
 171
 172         smbc_setOptionFullTimeNames(context, False);
 173         smbc_setOptionOpenShareMode(context, SMBC_SHAREMODE_DENY_NONE);
 174         smbc_setOptionSmbEncryptionLevel(context, SMBC_ENCRYPTLEVEL_NONE);
 175         smbc_setOptionUseCCache(context, True);
 176         smbc_setOptionCaseSensitive(context, False);
 177         smbc_setOptionBrowseMaxLmbCount(context, 3);    /* # LMBs to query */
 178         smbc_setOptionUrlEncodeReaddirEntries(context, False);
 179         smbc_setOptionOneSharePerServer(context, False);
 180         if (getenv("LIBSMBCLIENT_NO_CCACHE") != NULL) {
 181                 smbc_setOptionUseCCache(context, false);
 182         }
 183
 184         smbc_setFunctionAuthData(context, SMBC_get_auth_data);
 185         smbc_setFunctionCheckServer(context, SMBC_check_server);
 186         smbc_setFunctionRemoveUnusedServer(context, SMBC_remove_unused_server);
 187
 188         smbc_setOptionUserData(context, NULL);
 189         smbc_setFunctionAddCachedServer(context, SMBC_add_cached_server);
 190         smbc_setFunctionGetCachedServer(context, SMBC_get_cached_server);
 191         smbc_setFunctionRemoveCachedServer(context, SMBC_remove_cached_server);
 192         smbc_setFunctionPurgeCachedServers(context, SMBC_purge_cached_servers);
 193
 194         smbc_setFunctionOpen(context, SMBC_open_ctx);
 195         smbc_setFunctionCreat(context, SMBC_creat_ctx);
 196         smbc_setFunctionRead(context, SMBC_read_ctx);
 197         smbc_setFunctionSplice(context, SMBC_splice_ctx);
 198         smbc_setFunctionWrite(context, SMBC_write_ctx);
 199         smbc_setFunctionClose(context, SMBC_close_ctx);
 200         smbc_setFunctionUnlink(context, SMBC_unlink_ctx);
 201         smbc_setFunctionRename(context, SMBC_rename_ctx);
 202         smbc_setFunctionLseek(context, SMBC_lseek_ctx);
 203         smbc_setFunctionFtruncate(context, SMBC_ftruncate_ctx);
 204         smbc_setFunctionStat(context, SMBC_stat_ctx);
 205         smbc_setFunctionStatVFS(context, SMBC_statvfs_ctx);
 206         smbc_setFunctionFstatVFS(context, SMBC_fstatvfs_ctx);
 207         smbc_setFunctionFstat(context, SMBC_fstat_ctx);
 208         smbc_setFunctionOpendir(context, SMBC_opendir_ctx);
 209         smbc_setFunctionClosedir(context, SMBC_closedir_ctx);
 210         smbc_setFunctionReaddir(context, SMBC_readdir_ctx);
 211         smbc_setFunctionReaddirPlus(context, SMBC_readdirplus_ctx);
 212         smbc_setFunctionReaddirPlus2(context, SMBC_readdirplus2_ctx);
 213         smbc_setFunctionGetdents(context, SMBC_getdents_ctx);
 214         smbc_setFunctionMkdir(context, SMBC_mkdir_ctx);
 215         smbc_setFunctionRmdir(context, SMBC_rmdir_ctx);
 216         smbc_setFunctionTelldir(context, SMBC_telldir_ctx);
 217         smbc_setFunctionLseekdir(context, SMBC_lseekdir_ctx);
 218         smbc_setFunctionFstatdir(context, SMBC_fstatdir_ctx);
 219         smbc_setFunctionNotify(context, SMBC_notify_ctx);
 220         smbc_setFunctionChmod(context, SMBC_chmod_ctx);
 221         smbc_setFunctionUtimes(context, SMBC_utimes_ctx);
 222         smbc_setFunctionSetxattr(context, SMBC_setxattr_ctx);
 223         smbc_setFunctionGetxattr(context, SMBC_getxattr_ctx);
 224         smbc_setFunctionRemovexattr(context, SMBC_removexattr_ctx);
 225         smbc_setFunctionListxattr(context, SMBC_listxattr_ctx);
 226
 227         smbc_setFunctionOpenPrintJob(context, SMBC_open_print_job_ctx);
 228         smbc_setFunctionPrintFile(context, SMBC_print_file_ctx);
 229         smbc_setFunctionListPrintJobs(context, SMBC_list_print_jobs_ctx);
 230         smbc_setFunctionUnlinkPrintJob(context, SMBC_unlink_print_job_ctx);
 231
 232         TALLOC_FREE(frame);
 233         return context;
 234 }
 235
 236 /*
 237  * Free a context
 238  *
 239  * Returns 0 on success. Otherwise returns 1, the SMBCCTX is _not_ freed
 240  * and thus you'll be leaking memory if not handled properly.
 241  *
 242  */
 243 int
 244 smbc_free_context(SMBCCTX *context,
 245                   int shutdown_ctx)
 246 {
 247         TALLOC_CTX *frame;
 248         if (!context) {
 249                 errno = EBADF;
 250                 return 1;
 251         }
 252
 253         frame = talloc_stackframe();
 254
 255         if (shutdown_ctx) {
 256                 SMBCFILE * f;
 257                 DEBUG(1,("Performing aggressive shutdown.\n"));
 258
 259                 f = context->internal->files;
 260                 while (f) {
 261                         SMBCFILE *next = f->next;
 262                         smbc_getFunctionClose(context)(context, f);
 263                         f = next;
 264                 }
 265                 context->internal->files = NULL;
 266
 267                 /* First try to remove the servers the nice way. */
 268                 if (smbc_getFunctionPurgeCachedServers(context)(context)) {
 269                         SMBCSRV * s;
 270                         SMBCSRV * next;
 271                         DEBUG(1, ("Could not purge all servers, "
 272                                   "Nice way shutdown failed.\n"));
 273                         s = context->internal->servers;
 274                         while (s) {
 275                                 DEBUG(1, ("Forced shutdown: %p (cli=%p)\n",
 276                                           s, s->cli));
 277                                 cli_shutdown(s->cli);
 278                                 smbc_getFunctionRemoveCachedServer(context)(context,
 279                                                                          s);
 280                                 next = s->next;
 281                                 DLIST_REMOVE(context->internal->servers, s);
 282                                 SAFE_FREE(s);
 283                                 s = next;
 284                         }
 285                         context->internal->servers = NULL;
 286                 }
 287         }
 288         else {
 289                 /* This is the polite way */
 290                 if (smbc_getFunctionPurgeCachedServers(context)(context)) {
 291                         DEBUG(1, ("Could not purge all servers, "
 292                                   "free_context failed.\n"));
 293                         errno = EBUSY;
 294                         TALLOC_FREE(frame);
 295                         return 1;
 296                 }
 297                 if (context->internal->servers) {
 298                         DEBUG(1, ("Active servers in context, "
 299                                   "free_context failed.\n"));
 300                         errno = EBUSY;
 301                         TALLOC_FREE(frame);
 302                         return 1;
 303                 }
 304                 if (context->internal->files) {
 305                         DEBUG(1, ("Active files in context, "
 306                                   "free_context failed.\n"));
 307                         errno = EBUSY;
 308                         TALLOC_FREE(frame);
 309                         return 1;
 310                 }
 311         }
 312
 313         /* Things we have to clean up */
 314         smbc_setWorkgroup(context, NULL);
 315         smbc_setNetbiosName(context, NULL);
 316         smbc_setUser(context, NULL);
 317
 318         DEBUG(3, ("Context %p successfully freed\n", context));
 319
 320         /* Free any DFS auth context. */
 321         TALLOC_FREE(context->internal->auth_info);
 322
 323         SAFE_FREE(context->internal);
 324         SAFE_FREE(context);
 325
 326         /* Protect access to the count of contexts in use */
 327         if (SMB_THREAD_LOCK(initialized_ctx_count_mutex) != 0) {
 328                 smb_panic("error locking 'initialized_ctx_count'");
 329         }
 330
 331         if (initialized_ctx_count) {
 332                 initialized_ctx_count--;
 333         }
 334
 335         if (initialized_ctx_count == 0) {
 336             SMBC_module_terminate();
 337         }
 338
 339         /* Unlock the mutex */
 340         if (SMB_THREAD_UNLOCK(initialized_ctx_count_mutex) != 0) {
 341                 smb_panic("error unlocking 'initialized_ctx_count'");
 342         }
 343
 344         TALLOC_FREE(frame);
 345         return 0;
 346 }
 347
 348
 349 /**
 350  * Deprecated interface.  Do not use.  Instead, use the various
 351  * smbc_setOption*() functions or smbc_setFunctionAuthDataWithContext().
 352  */
 353 void
 354 smbc_option_set(SMBCCTX *context,
 355                 char *option_name,
 356                 ... /* option_value */)
 357 {
 358         va_list ap;
 359         union {
 360                 int i;
 361                 bool b;
 362                 smbc_get_auth_data_with_context_fn auth_fn;
 363                 void *v;
 364                 const char *s;
 365         } option_value;
 366
 367         TALLOC_CTX *frame = talloc_stackframe();
 368
 369         va_start(ap, option_name);
 370
 371         if (strcmp(option_name, "debug_to_stderr") == 0) {
 372                 option_value.b = (bool) va_arg(ap, int);
 373                 smbc_setOptionDebugToStderr(context, option_value.b);
 374
 375         } else if (strcmp(option_name, "full_time_names") == 0) {
 376                 option_value.b = (bool) va_arg(ap, int);
 377                 smbc_setOptionFullTimeNames(context, option_value.b);
 378
 379         } else if (strcmp(option_name, "open_share_mode") == 0) {
 380                 option_value.i = va_arg(ap, int);
 381                 smbc_setOptionOpenShareMode(context, option_value.i);
 382
 383         } else if (strcmp(option_name, "auth_function") == 0) {
 384                 option_value.auth_fn =
 385                         va_arg(ap, smbc_get_auth_data_with_context_fn);
 386                 smbc_setFunctionAuthDataWithContext(context, option_value.auth_fn);
 387
 388         } else if (strcmp(option_name, "user_data") == 0) {
 389                 option_value.v = va_arg(ap, void *);
 390                 smbc_setOptionUserData(context, option_value.v);
 391
 392         } else if (strcmp(option_name, "smb_encrypt_level") == 0) {
 393                 option_value.s = va_arg(ap, const char *);
 394                 if (strcmp(option_value.s, "none") == 0) {
 395                         smbc_setOptionSmbEncryptionLevel(context,
 396                                                          SMBC_ENCRYPTLEVEL_NONE);
 397                 } else if (strcmp(option_value.s, "request") == 0) {
 398                         smbc_setOptionSmbEncryptionLevel(context,
 399                                                          SMBC_ENCRYPTLEVEL_REQUEST);
 400                 } else if (strcmp(option_value.s, "require") == 0) {
 401                         smbc_setOptionSmbEncryptionLevel(context,
 402                                                          SMBC_ENCRYPTLEVEL_REQUIRE);
 403                 }
 404
 405         } else if (strcmp(option_name, "browse_max_lmb_count") == 0) {
 406                 option_value.i = va_arg(ap, int);
 407                 smbc_setOptionBrowseMaxLmbCount(context, option_value.i);
 408
 409         } else if (strcmp(option_name, "urlencode_readdir_entries") == 0) {
 410                 option_value.b = (bool) va_arg(ap, int);
 411                 smbc_setOptionUrlEncodeReaddirEntries(context, option_value.b);
 412
 413         } else if (strcmp(option_name, "one_share_per_server") == 0) {
 414                 option_value.b = (bool) va_arg(ap, int);
 415                 smbc_setOptionOneSharePerServer(context, option_value.b);
 416
 417         } else if (strcmp(option_name, "use_kerberos") == 0) {
 418                 option_value.b = (bool) va_arg(ap, int);
 419                 smbc_setOptionUseKerberos(context, option_value.b);
 420
 421         } else if (strcmp(option_name, "fallback_after_kerberos") == 0) {
 422                 option_value.b = (bool) va_arg(ap, int);
 423                 smbc_setOptionFallbackAfterKerberos(context, option_value.b);
 424
 425         } else if (strcmp(option_name, "use_ccache") == 0) {
 426                 option_value.b = (bool) va_arg(ap, int);
 427                 smbc_setOptionUseCCache(context, option_value.b);
 428
 429         } else if (strcmp(option_name, "no_auto_anonymous_login") == 0) {
 430                 option_value.b = (bool) va_arg(ap, int);
 431                 smbc_setOptionNoAutoAnonymousLogin(context, option_value.b);
 432         }
 433
 434         va_end(ap);
 435         TALLOC_FREE(frame);
 436 }
 437
 438
 439 /*
 440  * Deprecated interface.  Do not use.  Instead, use the various
 441  * smbc_getOption*() functions.
 442  */
 443 void *
 444 smbc_option_get(SMBCCTX *context,
 445                 char *option_name)
 446 {
 447         if (strcmp(option_name, "debug_stderr") == 0) {
 448 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 449                 return (void *) (intptr_t) smbc_getOptionDebugToStderr(context);
 450 #else
 451                 return (void *) smbc_getOptionDebugToStderr(context);
 452 #endif
 453
 454         } else if (strcmp(option_name, "full_time_names") == 0) {
 455 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 456                 return (void *) (intptr_t) smbc_getOptionFullTimeNames(context);
 457 #else
 458                 return (void *) smbc_getOptionFullTimeNames(context);
 459 #endif
 460
 461         } else if (strcmp(option_name, "open_share_mode") == 0) {
 462 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 463                 return (void *) (intptr_t) smbc_getOptionOpenShareMode(context);
 464 #else
 465                 return (void *) smbc_getOptionOpenShareMode(context);
 466 #endif
 467
 468         } else if (strcmp(option_name, "auth_function") == 0) {
 469                 return (void *) smbc_getFunctionAuthDataWithContext(context);
 470
 471         } else if (strcmp(option_name, "user_data") == 0) {
 472                 return smbc_getOptionUserData(context);
 473
 474         } else if (strcmp(option_name, "smb_encrypt_level") == 0) {
 475                 switch(smbc_getOptionSmbEncryptionLevel(context))
 476                 {
 477                 case 0:
 478                         return discard_const_p(void, "none");
 479                 case 1:
 480                         return discard_const_p(void, "request");
 481                 case 2:
 482                         return discard_const_p(void, "require");
 483                 }
 484
 485         } else if (strcmp(option_name, "smb_encrypt_on") == 0) {
 486                 SMBCSRV *s;
 487                 unsigned int num_servers = 0;
 488
 489                 for (s = context->internal->servers; s; s = s->next) {
 490                         num_servers++;
 491                         if (!cli_state_is_encryption_on(s->cli)) {
 492                                 return (void *)false;
 493                         }
 494                 }
 495 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 496                 return (void *) (intptr_t) (bool) (num_servers > 0);
 497 #else
 498                 return (void *) (bool) (num_servers > 0);
 499 #endif
 500
 501         } else if (strcmp(option_name, "browse_max_lmb_count") == 0) {
 502 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 503                 return (void *) (intptr_t) smbc_getOptionBrowseMaxLmbCount(context);
 504 #else
 505                 return (void *) smbc_getOptionBrowseMaxLmbCount(context);
 506 #endif
 507
 508         } else if (strcmp(option_name, "urlencode_readdir_entries") == 0) {
 509 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 510                 return (void *)(intptr_t) smbc_getOptionUrlEncodeReaddirEntries(context);
 511 #else
 512                 return (void *) (bool) smbc_getOptionUrlEncodeReaddirEntries(context);
 513 #endif
 514
 515         } else if (strcmp(option_name, "one_share_per_server") == 0) {
 516 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 517                 return (void *) (intptr_t) smbc_getOptionOneSharePerServer(context);
 518 #else
 519                 return (void *) (bool) smbc_getOptionOneSharePerServer(context);
 520 #endif
 521
 522         } else if (strcmp(option_name, "use_kerberos") == 0) {
 523 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 524                 return (void *) (intptr_t) smbc_getOptionUseKerberos(context);
 525 #else
 526                 return (void *) (bool) smbc_getOptionUseKerberos(context);
 527 #endif
 528
 529         } else if (strcmp(option_name, "fallback_after_kerberos") == 0) {
 530 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 531                 return (void *)(intptr_t) smbc_getOptionFallbackAfterKerberos(context);
 532 #else
 533                 return (void *) (bool) smbc_getOptionFallbackAfterKerberos(context);
 534 #endif
 535
 536         } else if (strcmp(option_name, "use_ccache") == 0) {
 537 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 538                 return (void *) (intptr_t) smbc_getOptionUseCCache(context);
 539 #else
 540                 return (void *) (bool) smbc_getOptionUseCCache(context);
 541 #endif
 542
 543         } else if (strcmp(option_name, "no_auto_anonymous_login") == 0) {
 544 #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
 545                 return (void *) (intptr_t) smbc_getOptionNoAutoAnonymousLogin(context);
 546 #else
 547                 return (void *) (bool) smbc_getOptionNoAutoAnonymousLogin(context);
 548 #endif
 549         }
 550
 551         return NULL;
 552 }
 553
 554
 555 /*
 556  * Initialize the library, etc.
 557  *
 558  * We accept a struct containing handle information.
 559  * valid values for info->debug from 0 to 100,
 560  * and insist that info->fn must be non-null.
 561  */
 562 SMBCCTX *
 563 smbc_init_context(SMBCCTX *context)
 564 {
 565         int pid;
 566         TALLOC_CTX *frame;
 567
 568         if (!context) {
 569                 errno = EBADF;
 570                 return NULL;
 571         }
 572
 573         /* Do not initialise the same client twice */
 574         if (context->internal->initialized) {
 575                 return NULL;
 576         }
 577
 578         frame = talloc_stackframe();
 579
 580         if ((!smbc_getFunctionAuthData(context) &&
 581              !smbc_getFunctionAuthDataWithContext(context)) ||
 582             smbc_getDebug(context) < 0 ||
 583             smbc_getDebug(context) > 100) {
 584
 585                 TALLOC_FREE(frame);
 586                 errno = EINVAL;
 587                 return NULL;
 588
 589         }
 590
 591         if (!smbc_getUser(context)) {
 592                 /*
 593                  * FIXME: Is this the best way to get the user info?
 594                  */
 595                 char *user = getenv("USER");
 596                 /* walk around as "guest" if no username can be found */
 597                 if (!user) {
 598                         user = SMB_STRDUP("guest");
 599                 } else {
 600                         user = SMB_STRDUP(user);
 601                 }
 602
 603                 if (!user) {
 604                         TALLOC_FREE(frame);
 605                         errno = ENOMEM;
 606                         return NULL;
 607                 }
 608
 609                 smbc_setUser(context, user);
 610                 SAFE_FREE(user);
 611
 612                 if (!smbc_getUser(context)) {
 613                         TALLOC_FREE(frame);
 614                         errno = ENOMEM;
 615                         return NULL;
 616                 }
 617         }
 618
 619         if (!smbc_getNetbiosName(context)) {
 620                 /*
 621                  * We try to get our netbios name from the config. If that
 622                  * fails we fall back on constructing our netbios name from
 623                  * our hostname etc
 624                  */
 625                 char *netbios_name;
 626                 if (lp_netbios_name()) {
 627                         netbios_name = SMB_STRDUP(lp_netbios_name());
 628                 } else {
 629                         /*
 630                          * Hmmm, I want to get hostname as well, but I am too
 631                          * lazy for the moment
 632                          */
 633                         pid = getpid();
 634                         netbios_name = (char *)SMB_MALLOC(17);
 635                         if (!netbios_name) {
 636                                 TALLOC_FREE(frame);
 637                                 errno = ENOMEM;
 638                                 return NULL;
 639                         }
 640                         slprintf(netbios_name, 16,
 641                                  "smbc%s%d", smbc_getUser(context), pid);
 642                 }
 643
 644                 if (!netbios_name) {
 645                         TALLOC_FREE(frame);
 646                         errno = ENOMEM;
 647                         return NULL;
 648                 }
 649
 650                 smbc_setNetbiosName(context, netbios_name);
 651                 SAFE_FREE(netbios_name);
 652
 653                 if (!smbc_getNetbiosName(context)) {
 654                         TALLOC_FREE(frame);
 655                         errno = ENOMEM;
 656                         return NULL;
 657                 }
 658         }
 659
 660         DEBUG(1, ("Using netbios name %s.\n", smbc_getNetbiosName(context)));
 661
 662         if (!smbc_getWorkgroup(context)) {
 663                 const char *workgroup;
 664
 665                 if (lp_workgroup()) {
 666                         workgroup = lp_workgroup();
 667                 } else {
 668                         /* TODO: Think about a decent default workgroup */
 669                         workgroup = "samba";
 670                 }
 671
 672                 smbc_setWorkgroup(context, workgroup);
 673
 674                 if (!smbc_getWorkgroup(context)) {
 675                         TALLOC_FREE(frame);
 676                         errno = ENOMEM;
 677                         return NULL;
 678                 }
 679         }
 680
 681         DEBUG(1, ("Using workgroup %s.\n", smbc_getWorkgroup(context)));
 682
 683         /* shortest timeout is 1 second */
 684         if (smbc_getTimeout(context) > 0 && smbc_getTimeout(context) < 1000)
 685                 smbc_setTimeout(context, 1000);
 686
 687         context->internal->initialized = True;
 688
 689         /* Protect access to the count of contexts in use */
 690         if (SMB_THREAD_LOCK(initialized_ctx_count_mutex) != 0) {
 691                 smb_panic("error locking 'initialized_ctx_count'");
 692         }
 693
 694         initialized_ctx_count++;
 695
 696         /* Unlock the mutex */
 697         if (SMB_THREAD_UNLOCK(initialized_ctx_count_mutex) != 0) {
 698                 smb_panic("error unlocking 'initialized_ctx_count'");
 699         }
 700
 701         TALLOC_FREE(frame);
 702         return context;
 703 }
 704
 705
 706 /* Return the version of samba, and thus libsmbclient */
 707 const char *
 708 smbc_version(void)
 709 {
 710         return samba_version_string();
 711 }
 712
 713 /*
 714  * Set the credentials so DFS will work when following referrals.
 715  * This function is broken and must be removed. No SMBCCTX arg...
 716  * JRA.
 717  */
 718
 719 void
 720 smbc_set_credentials(const char *workgroup,
 721                         const char *user,
 722                         const char *password,
 723                         smbc_bool use_kerberos,
 724                         const char *signing_state)
 725 {
 726         d_printf("smbc_set_credentials is obsolete. Replace with smbc_set_credentials_with_fallback().\n");
 727 }
 728
 729 void smbc_set_credentials_with_fallback(SMBCCTX *context,
 730                                         const char *workgroup,
 731                                         const char *user,
 732                                         const char *password)
 733 {
 734         smbc_bool use_kerberos = false;
 735         const char *signing_state = "off";
 736         struct user_auth_info *auth_info = NULL;
 737         TALLOC_CTX *frame;
 738
 739         if (! context) {
 740
 741                 return;
 742         }
 743
 744         frame = talloc_stackframe();
 745
 746         if (! workgroup || ! *workgroup) {
 747                 workgroup = smbc_getWorkgroup(context);
 748         }
 749
 750         if (! user) {
 751                 user = smbc_getUser(context);
 752         }
 753
 754         if (! password) {
 755                 password = "";
 756         }
 757
 758         auth_info = user_auth_info_init(NULL);
 759
 760         if (! auth_info) {
 761                 DEBUG(0, ("smbc_set_credentials_with_fallback: allocation fail\n"));
 762                 TALLOC_FREE(frame);
 763                 return;
 764         }
 765
 766         if (smbc_getOptionUseKerberos(context)) {
 767                 use_kerberos = True;
 768         }
 769
 770         if (lp_client_signing() != SMB_SIGNING_OFF) {
 771                 signing_state = "if_required";
 772         }
 773
 774         if (lp_client_signing() == SMB_SIGNING_REQUIRED) {
 775                 signing_state = "required";
 776         }
 777
 778         set_cmdline_auth_info_username(auth_info, user);
 779         set_cmdline_auth_info_domain(auth_info, workgroup);
 780         set_cmdline_auth_info_password(auth_info, password);
 781         set_cmdline_auth_info_use_kerberos(auth_info, use_kerberos);
 782         set_cmdline_auth_info_signing_state(auth_info, signing_state);
 783         set_cmdline_auth_info_fallback_after_kerberos(auth_info,
 784                 smbc_getOptionFallbackAfterKerberos(context));
 785         set_cmdline_auth_info_use_ccache(
 786                 auth_info, smbc_getOptionUseCCache(context));
 787
 788         TALLOC_FREE(context->internal->auth_info);
 789
 790         context->internal->auth_info = auth_info;
 791         TALLOC_FREE(frame);
 792 }