source3/lib/substitute.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    string substitution functions
   4    Copyright (C) Andrew Tridgell 1992-2000
   5    Copyright (C) Gerald Carter   2006
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21
  22 #include "includes.h"
  23
  24 extern struct current_user current_user;
  25
  26 fstring local_machine="";
  27 fstring remote_arch="UNKNOWN";
  28 userdom_struct current_user_info;
  29 fstring remote_proto="UNKNOWN";
  30
  31 static fstring remote_machine;
  32 static fstring smb_user_name;
  33
  34 /**
  35  * Set the 'local' machine name
  36  * @param local_name the name we are being called
  37  * @param if this is the 'final' name for us, not be be changed again
  38  */
  39
  40 void set_local_machine_name(const char* local_name, bool perm)
  41 {
  42         static bool already_perm = False;
  43         fstring tmp_local_machine;
  44
  45         fstrcpy(tmp_local_machine,local_name);
  46         trim_char(tmp_local_machine,' ',' ');
  47
  48         /*
  49          * Windows NT/2k uses "*SMBSERVER" and XP uses "*SMBSERV"
  50          * arrggg!!!
  51          */
  52
  53         if ( strequal(tmp_local_machine, "*SMBSERVER") || strequal(tmp_local_machine, "*SMBSERV") )  {
  54                 fstrcpy( local_machine, client_socket_addr() );
  55                 return;
  56         }
  57
  58         if (already_perm)
  59                 return;
  60
  61         already_perm = perm;
  62
  63         alpha_strcpy(local_machine,tmp_local_machine,SAFE_NETBIOS_CHARS,sizeof(local_machine)-1);
  64         strlower_m(local_machine);
  65 }
  66
  67 /**
  68  * Set the 'remote' machine name
  69  * @param remote_name the name our client wants to be called by
  70  * @param if this is the 'final' name for them, not be be changed again
  71  */
  72
  73 void set_remote_machine_name(const char* remote_name, bool perm)
  74 {
  75         static bool already_perm = False;
  76         fstring tmp_remote_machine;
  77
  78         if (already_perm)
  79                 return;
  80
  81         already_perm = perm;
  82
  83         fstrcpy(tmp_remote_machine,remote_name);
  84         trim_char(tmp_remote_machine,' ',' ');
  85         alpha_strcpy(remote_machine,tmp_remote_machine,SAFE_NETBIOS_CHARS,sizeof(remote_machine)-1);
  86         strlower_m(remote_machine);
  87 }
  88
  89 const char* get_remote_machine_name(void)
  90 {
  91         return remote_machine;
  92 }
  93
  94 const char* get_local_machine_name(void)
  95 {
  96         if (!*local_machine) {
  97                 return global_myname();
  98         }
  99
 100         return local_machine;
 101 }
 102
 103 /*******************************************************************
 104  Setup the string used by %U substitution.
 105 ********************************************************************/
 106
 107 void sub_set_smb_name(const char *name)
 108 {
 109         fstring tmp;
 110         int len;
 111         bool is_machine_account = False;
 112
 113         /* don't let anonymous logins override the name */
 114         if (! *name)
 115                 return;
 116
 117
 118         fstrcpy( tmp, name );
 119         trim_char( tmp, ' ', ' ' );
 120         strlower_m( tmp );
 121
 122         len = strlen( tmp );
 123
 124         if ( len == 0 )
 125                 return;
 126
 127         /* long story but here goes....we have to allow usernames
 128            ending in '$' as they are valid machine account names.
 129            So check for a machine account and re-add the '$'
 130            at the end after the call to alpha_strcpy().   --jerry  */
 131
 132         if ( tmp[len-1] == '$' )
 133                 is_machine_account = True;
 134
 135         alpha_strcpy( smb_user_name, tmp, SAFE_NETBIOS_CHARS, sizeof(smb_user_name)-1 );
 136
 137         if ( is_machine_account ) {
 138                 len = strlen( smb_user_name );
 139                 smb_user_name[len-1] = '$';
 140         }
 141 }
 142
 143 /*******************************************************************
 144  Setup the strings used by substitutions. Called per packet. Ensure
 145  %U name is set correctly also.
 146 ********************************************************************/
 147
 148 void set_current_user_info(const userdom_struct *pcui)
 149 {
 150         current_user_info = *pcui;
 151         /* The following is safe as current_user_info.smb_name
 152          * has already been sanitised in register_existing_vuid. */
 153         fstrcpy(smb_user_name, current_user_info.smb_name);
 154 }
 155
 156 /*******************************************************************
 157  return the current active user name
 158 *******************************************************************/
 159
 160 const char* get_current_username( void )
 161 {
 162         if ( current_user_info.smb_name[0] == '\0' )
 163                 return smb_user_name;
 164
 165         return current_user_info.smb_name;
 166 }
 167
 168 /*******************************************************************
 169  Given a pointer to a %$(NAME) in p and the whole string in str
 170  expand it as an environment variable.
 171  Return a new allocated and expanded string.
 172  Based on code by Branko Cibej <branko.cibej@hermes.si>
 173  When this is called p points at the '%' character.
 174  May substitute multiple occurrencies of the same env var.
 175 ********************************************************************/
 176
 177 static char * realloc_expand_env_var(char *str, char *p)
 178 {
 179         char *envname;
 180         char *envval;
 181         char *q, *r;
 182         int copylen;
 183
 184         if (p[0] != '%' || p[1] != '$' || p[2] != '(') {
 185                 return str;
 186         }
 187
 188         /*
 189          * Look for the terminating ')'.
 190          */
 191
 192         if ((q = strchr_m(p,')')) == NULL) {
 193                 DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
 194                 return str;
 195         }
 196
 197         /*
 198          * Extract the name from within the %$(NAME) string.
 199          */
 200
 201         r = p + 3;
 202         copylen = q - r;
 203
 204         /* reserve space for use later add %$() chars */
 205         if ( (envname = (char *)SMB_MALLOC(copylen + 1 + 4)) == NULL ) {
 206                 return NULL;
 207         }
 208
 209         strncpy(envname,r,copylen);
 210         envname[copylen] = '\0';
 211
 212         if ((envval = getenv(envname)) == NULL) {
 213                 DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
 214                 SAFE_FREE(envname);
 215                 return str;
 216         }
 217
 218         /*
 219          * Copy the full %$(NAME) into envname so it
 220          * can be replaced.
 221          */
 222
 223         copylen = q + 1 - p;
 224         strncpy(envname,p,copylen);
 225         envname[copylen] = '\0';
 226         r = realloc_string_sub(str, envname, envval);
 227         SAFE_FREE(envname);
 228
 229         return r;
 230 }
 231
 232 /*******************************************************************
 233 *******************************************************************/
 234
 235 static char *longvar_domainsid( void )
 236 {
 237         DOM_SID sid;
 238         char *sid_string;
 239
 240         if ( !secrets_fetch_domain_sid( lp_workgroup(), &sid ) ) {
 241                 return NULL;
 242         }
 243
 244         sid_string = SMB_STRDUP( sid_string_static( &sid ) );
 245
 246         if ( !sid_string ) {
 247                 DEBUG(0,("longvar_domainsid: failed to dup SID string!\n"));
 248         }
 249
 250         return sid_string;
 251 }
 252
 253 /*******************************************************************
 254 *******************************************************************/
 255
 256 struct api_longvar {
 257         const char *name;
 258         char* (*fn)( void );
 259 };
 260
 261 static struct api_longvar longvar_table[] = {
 262         { "DomainSID",          longvar_domainsid },
 263         { NULL,                 NULL }
 264 };
 265
 266 static char *get_longvar_val( const char *varname )
 267 {
 268         int i;
 269
 270         DEBUG(7,("get_longvar_val: expanding variable [%s]\n", varname));
 271
 272         for ( i=0; longvar_table[i].name; i++ ) {
 273                 if ( strequal( longvar_table[i].name, varname ) ) {
 274                         return longvar_table[i].fn();
 275                 }
 276         }
 277
 278         return NULL;
 279 }
 280
 281 /*******************************************************************
 282  Expand the long smb.conf variable names given a pointer to a %(NAME).
 283  Return the number of characters by which the pointer should be advanced.
 284  When this is called p points at the '%' character.
 285 ********************************************************************/
 286
 287 static char *realloc_expand_longvar(char *str, char *p)
 288 {
 289         fstring varname;
 290         char *value;
 291         char *q, *r;
 292         int copylen;
 293
 294         if ( p[0] != '%' || p[1] != '(' ) {
 295                 return str;
 296         }
 297
 298         /* Look for the terminating ')'.*/
 299
 300         if ((q = strchr_m(p,')')) == NULL) {
 301                 DEBUG(0,("realloc_expand_longvar: Unterminated environment variable [%s]\n", p));
 302                 return str;
 303         }
 304
 305         /* Extract the name from within the %(NAME) string.*/
 306
 307         r = p+2;
 308         copylen = MIN( (q-r), (sizeof(varname)-1) );
 309         strncpy(varname, r, copylen);
 310         varname[copylen] = '\0';
 311
 312         if ((value = get_longvar_val(varname)) == NULL) {
 313                 DEBUG(0,("realloc_expand_longvar: Variable [%s] not set.  Skipping\n", varname));
 314                 return str;
 315         }
 316
 317         /* Copy the full %(NAME) into envname so it can be replaced.*/
 318
 319         copylen = MIN( (q+1-p),(sizeof(varname)-1) );
 320         strncpy( varname, p, copylen );
 321         varname[copylen] = '\0';
 322         r = realloc_string_sub(str, varname, value);
 323         SAFE_FREE( value );
 324
 325         /* skip over the %(varname) */
 326
 327         return r;
 328 }
 329
 330 /*******************************************************************
 331  Patch from jkf@soton.ac.uk
 332  Added this to implement %p (NIS auto-map version of %H)
 333 *******************************************************************/
 334
 335 static char *automount_path(const char *user_name)
 336 {
 337         pstring server_path;
 338
 339         /* use the passwd entry as the default */
 340         /* this will be the default if WITH_AUTOMOUNT is not used or fails */
 341
 342         pstrcpy(server_path, get_user_home_dir(user_name));
 343
 344 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
 345
 346         if (lp_nis_home_map()) {
 347                 const char *home_path_start;
 348                 const char *automount_value = automount_lookup(user_name);
 349
 350                 if(strlen(automount_value) > 0) {
 351                         home_path_start = strchr_m(automount_value,':');
 352                         if (home_path_start != NULL) {
 353                                 DEBUG(5, ("NIS lookup succeeded.  Home path is: %s\n",
 354                                                 home_path_start?(home_path_start+1):""));
 355                                 pstrcpy(server_path, home_path_start+1);
 356                         }
 357                 } else {
 358                         /* NIS key lookup failed: default to user home directory from password file */
 359                         DEBUG(5, ("NIS lookup failed. Using Home path from passwd file. Home path is: %s\n", server_path ));
 360                 }
 361         }
 362 #endif
 363
 364         DEBUG(4,("Home server path: %s\n", server_path));
 365
 366         return talloc_strdup(talloc_tos(), server_path);
 367 }
 368
 369 /*******************************************************************
 370  Patch from jkf@soton.ac.uk
 371  This is Luke's original function with the NIS lookup code
 372  moved out to a separate function.
 373 *******************************************************************/
 374
 375 static const char *automount_server(const char *user_name)
 376 {
 377         pstring server_name;
 378         const char *local_machine_name = get_local_machine_name();
 379
 380         /* use the local machine name as the default */
 381         /* this will be the default if WITH_AUTOMOUNT is not used or fails */
 382         if (local_machine_name && *local_machine_name)
 383                 pstrcpy(server_name, local_machine_name);
 384         else
 385                 pstrcpy(server_name, global_myname());
 386
 387 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
 388
 389         if (lp_nis_home_map()) {
 390                 int home_server_len;
 391                 char *automount_value = automount_lookup(user_name);
 392                 home_server_len = strcspn(automount_value,":");
 393                 DEBUG(5, ("NIS lookup succeeded.  Home server length: %d\n",home_server_len));
 394                 if (home_server_len > sizeof(pstring))
 395                         home_server_len = sizeof(pstring);
 396                 strncpy(server_name, automount_value, home_server_len);
 397                 server_name[home_server_len] = '\0';
 398         }
 399 #endif
 400
 401         DEBUG(4,("Home server: %s\n", server_name));
 402
 403         return talloc_strdup(talloc_tos(), server_name);
 404 }
 405
 406 /****************************************************************************
 407  Do some standard substitutions in a string.
 408  len is the length in bytes of the space allowed in string str. If zero means
 409  don't allow expansions.
 410 ****************************************************************************/
 411
 412 void standard_sub_basic(const char *smb_name, const char *domain_name,
 413                         char *str, size_t len)
 414 {
 415         char *s;
 416
 417         if ( (s = alloc_sub_basic( smb_name, domain_name, str )) != NULL ) {
 418                 strncpy( str, s, len );
 419         }
 420
 421         SAFE_FREE( s );
 422
 423 }
 424
 425 /****************************************************************************
 426  Do some standard substitutions in a string.
 427  This function will return an allocated string that have to be freed.
 428 ****************************************************************************/
 429
 430 char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name,
 431                        const char *domain_name, const char *str)
 432 {
 433         char *a, *t;
 434
 435         if ( (a = alloc_sub_basic(smb_name, domain_name, str)) == NULL ) {
 436                 return NULL;
 437         }
 438         t = talloc_strdup(mem_ctx, a);
 439         SAFE_FREE(a);
 440         return t;
 441 }
 442
 443 /****************************************************************************
 444 ****************************************************************************/
 445
 446 char *alloc_sub_basic(const char *smb_name, const char *domain_name,
 447                       const char *str)
 448 {
 449         char *b, *p, *s, *r, *a_string;
 450         fstring pidstr, vnnstr;
 451         struct passwd *pass;
 452         char addr[INET6_ADDRSTRLEN];
 453         const char *local_machine_name = get_local_machine_name();
 454
 455         /* workaround to prevent a crash while looking at bug #687 */
 456
 457         if (!str) {
 458                 DEBUG(0,("alloc_sub_basic: NULL source string!  This should not happen\n"));
 459                 return NULL;
 460         }
 461
 462         a_string = SMB_STRDUP(str);
 463         if (a_string == NULL) {
 464                 DEBUG(0, ("alloc_sub_basic: Out of memory!\n"));
 465                 return NULL;
 466         }
 467
 468         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 469
 470                 r = NULL;
 471                 b = a_string;
 472
 473                 switch (*(p+1)) {
 474                 case 'U' :
 475                         r = strdup_lower(smb_name);
 476                         if (r == NULL) {
 477                                 goto error;
 478                         }
 479                         a_string = realloc_string_sub(a_string, "%U", r);
 480                         break;
 481                 case 'G' :
 482                         r = SMB_STRDUP(smb_name);
 483                         if (r == NULL) {
 484                                 goto error;
 485                         }
 486                         if ((pass = Get_Pwnam(r))!=NULL) {
 487                                 a_string = realloc_string_sub(a_string, "%G", gidtoname(pass->pw_gid));
 488                         }
 489                         break;
 490                 case 'D' :
 491                         r = strdup_upper(domain_name);
 492                         if (r == NULL) {
 493                                 goto error;
 494                         }
 495                         a_string = realloc_string_sub(a_string, "%D", r);
 496                         break;
 497                 case 'I' :
 498                         a_string = realloc_string_sub(a_string, "%I", client_addr(addr));
 499                         break;
 500                 case 'i':
 501                         a_string = realloc_string_sub( a_string, "%i", client_socket_addr() );
 502                         break;
 503                 case 'L' :
 504                         if ( StrnCaseCmp(p, "%LOGONSERVER%", strlen("%LOGONSERVER%")) == 0 ) {
 505                                 break;
 506                         }
 507                         if (local_machine_name && *local_machine_name) {
 508                                 a_string = realloc_string_sub(a_string, "%L", local_machine_name);
 509                         } else {
 510                                 a_string = realloc_string_sub(a_string, "%L", global_myname());
 511                         }
 512                         break;
 513                 case 'N':
 514                         a_string = realloc_string_sub(a_string, "%N", automount_server(smb_name));
 515                         break;
 516                 case 'M' :
 517                         a_string = realloc_string_sub(a_string, "%M", client_name());
 518                         break;
 519                 case 'R' :
 520                         a_string = realloc_string_sub(a_string, "%R", remote_proto);
 521                         break;
 522                 case 'T' :
 523                         a_string = realloc_string_sub(a_string, "%T", current_timestring(False));
 524                         break;
 525                 case 'a' :
 526                         a_string = realloc_string_sub(a_string, "%a", remote_arch);
 527                         break;
 528                 case 'd' :
 529                         slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
 530                         a_string = realloc_string_sub(a_string, "%d", pidstr);
 531                         break;
 532                 case 'h' :
 533                         a_string = realloc_string_sub(a_string, "%h", myhostname());
 534                         break;
 535                 case 'm' :
 536                         a_string = realloc_string_sub(a_string, "%m", remote_machine);
 537                         break;
 538                 case 'v' :
 539                         a_string = realloc_string_sub(a_string, "%v", SAMBA_VERSION_STRING);
 540                         break;
 541                 case 'w' :
 542                         a_string = realloc_string_sub(a_string, "%w", lp_winbind_separator());
 543                         break;
 544                 case '$' :
 545                         a_string = realloc_expand_env_var(a_string, p); /* Expand environment variables */
 546                         break;
 547                 case '(':
 548                         a_string = realloc_expand_longvar( a_string, p );
 549                         break;
 550                 case 'V' :
 551                         slprintf(vnnstr,sizeof(vnnstr)-1, "%u", get_my_vnn());
 552                         a_string = realloc_string_sub(a_string, "%V", vnnstr);
 553                         break;
 554                 default:
 555                         break;
 556                 }
 557
 558                 p++;
 559                 SAFE_FREE(r);
 560
 561                 if ( !a_string ) {
 562                         return NULL;
 563                 }
 564         }
 565
 566         return a_string;
 567
 568 error:
 569         SAFE_FREE(a_string);
 570         return NULL;
 571 }
 572
 573 /****************************************************************************
 574  Do some specific substitutions in a string.
 575  This function will return an allocated string that have to be freed.
 576 ****************************************************************************/
 577
 578 char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
 579                         const char *input_string,
 580                         const char *username,
 581                         const char *domain,
 582                         uid_t uid,
 583                         gid_t gid)
 584 {
 585         char *a_string;
 586         char *ret_string = NULL;
 587         char *b, *p, *s;
 588         TALLOC_CTX *tmp_ctx;
 589
 590         if (!(tmp_ctx = talloc_new(mem_ctx))) {
 591                 DEBUG(0, ("talloc_new failed\n"));
 592                 return NULL;
 593         }
 594
 595         a_string = talloc_strdup(tmp_ctx, input_string);
 596         if (a_string == NULL) {
 597                 DEBUG(0, ("talloc_sub_specified: Out of memory!\n"));
 598                 goto done;
 599         }
 600
 601         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 602
 603                 b = a_string;
 604
 605                 switch (*(p+1)) {
 606                 case 'U' :
 607                         a_string = talloc_string_sub(
 608                                 tmp_ctx, a_string, "%U", username);
 609                         break;
 610                 case 'u' :
 611                         a_string = talloc_string_sub(
 612                                 tmp_ctx, a_string, "%u", username);
 613                         break;
 614                 case 'G' :
 615                         if (gid != -1) {
 616                                 a_string = talloc_string_sub(
 617                                         tmp_ctx, a_string, "%G",
 618                                         gidtoname(gid));
 619                         } else {
 620                                 a_string = talloc_string_sub(
 621                                         tmp_ctx, a_string,
 622                                         "%G", "NO_GROUP");
 623                         }
 624                         break;
 625                 case 'g' :
 626                         if (gid != -1) {
 627                                 a_string = talloc_string_sub(
 628                                         tmp_ctx, a_string, "%g",
 629                                         gidtoname(gid));
 630                         } else {
 631                                 a_string = talloc_string_sub(
 632                                         tmp_ctx, a_string, "%g", "NO_GROUP");
 633                         }
 634                         break;
 635                 case 'D' :
 636                         a_string = talloc_string_sub(tmp_ctx, a_string,
 637                                                      "%D", domain);
 638                         break;
 639                 case 'N' :
 640                         a_string = talloc_string_sub(
 641                                 tmp_ctx, a_string, "%N",
 642                                 automount_server(username));
 643                         break;
 644                 default:
 645                         break;
 646                 }
 647
 648                 p++;
 649                 if (a_string == NULL) {
 650                         goto done;
 651                 }
 652         }
 653
 654         /* Watch out, using "mem_ctx" here, so all intermediate stuff goes
 655          * away with the TALLOC_FREE(tmp_ctx) further down. */
 656
 657         ret_string = talloc_sub_basic(mem_ctx, username, domain, a_string);
 658
 659  done:
 660         TALLOC_FREE(tmp_ctx);
 661         return ret_string;
 662 }
 663
 664 /****************************************************************************
 665 ****************************************************************************/
 666
 667 static char *alloc_sub_advanced(const char *servicename, const char *user,
 668                          const char *connectpath, gid_t gid,
 669                          const char *smb_name, const char *domain_name,
 670                          const char *str)
 671 {
 672         char *a_string, *ret_string;
 673         char *b, *p, *s, *h;
 674
 675         a_string = SMB_STRDUP(str);
 676         if (a_string == NULL) {
 677                 DEBUG(0, ("alloc_sub_advanced: Out of memory!\n"));
 678                 return NULL;
 679         }
 680
 681         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 682
 683                 b = a_string;
 684
 685                 switch (*(p+1)) {
 686                 case 'N' :
 687                         a_string = realloc_string_sub(a_string, "%N", automount_server(user));
 688                         break;
 689                 case 'H':
 690                         if ((h = get_user_home_dir(user)))
 691                                 a_string = realloc_string_sub(a_string, "%H", h);
 692                         break;
 693                 case 'P':
 694                         a_string = realloc_string_sub(a_string, "%P", connectpath);
 695                         break;
 696                 case 'S':
 697                         a_string = realloc_string_sub(a_string, "%S", servicename);
 698                         break;
 699                 case 'g':
 700                         a_string = realloc_string_sub(a_string, "%g", gidtoname(gid));
 701                         break;
 702                 case 'u':
 703                         a_string = realloc_string_sub(a_string, "%u", user);
 704                         break;
 705
 706                         /* Patch from jkf@soton.ac.uk Left the %N (NIS
 707                          * server name) in standard_sub_basic as it is
 708                          * a feature for logon servers, hence uses the
 709                          * username.  The %p (NIS server path) code is
 710                          * here as it is used instead of the default
 711                          * "path =" string in [homes] and so needs the
 712                          * service name, not the username.  */
 713                 case 'p':
 714                         a_string = realloc_string_sub(a_string, "%p",
 715                                                       automount_path(servicename));
 716                         break;
 717
 718                 default:
 719                         break;
 720                 }
 721
 722                 p++;
 723                 if (a_string == NULL) {
 724                         return NULL;
 725                 }
 726         }
 727
 728         ret_string = alloc_sub_basic(smb_name, domain_name, a_string);
 729         SAFE_FREE(a_string);
 730         return ret_string;
 731 }
 732
 733 /*
 734  * This obviously is inefficient and needs to be merged into
 735  * alloc_sub_advanced...
 736  */
 737
 738 char *talloc_sub_advanced(TALLOC_CTX *mem_ctx,
 739                           const char *servicename, const char *user,
 740                           const char *connectpath, gid_t gid,
 741                           const char *smb_name, const char *domain_name,
 742                           const char *str)
 743 {
 744         char *a, *t;
 745
 746         if (!(a = alloc_sub_advanced(servicename, user, connectpath, gid,
 747                                      smb_name, domain_name, str))) {
 748                 return NULL;
 749         }
 750         t = talloc_strdup(mem_ctx, a);
 751         SAFE_FREE(a);
 752         return t;
 753 }
 754
 755
 756 void standard_sub_advanced(const char *servicename, const char *user,
 757                            const char *connectpath, gid_t gid,
 758                            const char *smb_name, const char *domain_name,
 759                            char *str, size_t len)
 760 {
 761         char *s;
 762
 763         s = alloc_sub_advanced(servicename, user, connectpath,
 764                                gid, smb_name, domain_name, str);
 765
 766         if ( s ) {
 767                 strncpy( str, s, len );
 768                 SAFE_FREE( s );
 769         }
 770 }
 771
 772 /****************************************************************************
 773  *  Do some standard substitutions in a string.
 774  *  ****************************************************************************/
 775
 776 void standard_sub_conn(connection_struct *conn, char *str, size_t len)
 777 {
 778         char *s;
 779
 780         s = alloc_sub_advanced(lp_servicename(SNUM(conn)), conn->user, conn->connectpath,
 781                                conn->gid, smb_user_name, "", str);
 782
 783         if ( s ) {
 784                 strncpy( str, s, len );
 785                 SAFE_FREE( s );
 786         }
 787 }
 788