source/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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22
  23 #include "includes.h"
  24
  25 extern struct current_user current_user;
  26
  27 fstring local_machine="";
  28 fstring remote_arch="UNKNOWN";
  29 userdom_struct current_user_info;
  30 fstring remote_proto="UNKNOWN";
  31
  32 static fstring remote_machine;
  33 static fstring smb_user_name;
  34
  35 /**
  36  * Set the 'local' machine name
  37  * @param local_name the name we are being called
  38  * @param if this is the 'final' name for us, not be be changed again
  39  */
  40
  41 void set_local_machine_name(const char* local_name, BOOL perm)
  42 {
  43         static BOOL already_perm = False;
  44         fstring tmp_local_machine;
  45
  46         fstrcpy(tmp_local_machine,local_name);
  47         trim_char(tmp_local_machine,' ',' ');
  48
  49         /*
  50          * Windows NT/2k uses "*SMBSERVER" and XP uses "*SMBSERV"
  51          * arrggg!!!
  52          */
  53
  54         if ( strequal(tmp_local_machine, "*SMBSERVER") || strequal(tmp_local_machine, "*SMBSERV") )  {
  55                 fstrcpy( local_machine, client_socket_addr() );
  56                 return;
  57         }
  58
  59         if (already_perm)
  60                 return;
  61
  62         already_perm = perm;
  63
  64         alpha_strcpy(local_machine,tmp_local_machine,SAFE_NETBIOS_CHARS,sizeof(local_machine)-1);
  65         strlower_m(local_machine);
  66 }
  67
  68 /**
  69  * Set the 'remote' machine name
  70  * @param remote_name the name our client wants to be called by
  71  * @param if this is the 'final' name for them, not be be changed again
  72  */
  73
  74 void set_remote_machine_name(const char* remote_name, BOOL perm)
  75 {
  76         static BOOL already_perm = False;
  77         fstring tmp_remote_machine;
  78
  79         if (already_perm)
  80                 return;
  81
  82         already_perm = perm;
  83
  84         fstrcpy(tmp_remote_machine,remote_name);
  85         trim_char(tmp_remote_machine,' ',' ');
  86         alpha_strcpy(remote_machine,tmp_remote_machine,SAFE_NETBIOS_CHARS,sizeof(remote_machine)-1);
  87         strlower_m(remote_machine);
  88 }
  89
  90 const char* get_remote_machine_name(void)
  91 {
  92         return remote_machine;
  93 }
  94
  95 const char* get_local_machine_name(void)
  96 {
  97         if (!*local_machine) {
  98                 return global_myname();
  99         }
 100
 101         return local_machine;
 102 }
 103
 104 /*******************************************************************
 105  Setup the string used by %U substitution.
 106 ********************************************************************/
 107
 108 void sub_set_smb_name(const char *name)
 109 {
 110         fstring tmp;
 111         int len;
 112         BOOL is_machine_account = False;
 113
 114         /* don't let anonymous logins override the name */
 115         if (! *name)
 116                 return;
 117
 118
 119         fstrcpy( tmp, name );
 120         trim_char( tmp, ' ', ' ' );
 121         strlower_m( tmp );
 122
 123         len = strlen( tmp );
 124
 125         if ( len == 0 )
 126                 return;
 127
 128         /* long story but here goes....we have to allow usernames
 129            ending in '$' as they are valid machine account names.
 130            So check for a machine account and re-add the '$'
 131            at the end after the call to alpha_strcpy().   --jerry  */
 132
 133         if ( tmp[len-1] == '$' )
 134                 is_machine_account = True;
 135
 136         alpha_strcpy( smb_user_name, tmp, SAFE_NETBIOS_CHARS, sizeof(smb_user_name)-1 );
 137
 138         if ( is_machine_account ) {
 139                 len = strlen( smb_user_name );
 140                 smb_user_name[len-1] = '$';
 141         }
 142 }
 143
 144 char* sub_get_smb_name( void )
 145 {
 146         return smb_user_name;
 147 }
 148
 149 /*******************************************************************
 150  Setup the strings used by substitutions. Called per packet. Ensure
 151  %U name is set correctly also.
 152 ********************************************************************/
 153
 154 void set_current_user_info(const userdom_struct *pcui)
 155 {
 156         current_user_info = *pcui;
 157         /* The following is safe as current_user_info.smb_name
 158          * has already been sanitised in register_vuid. */
 159         fstrcpy(smb_user_name, current_user_info.smb_name);
 160 }
 161
 162 /*******************************************************************
 163  return the current active user name
 164 *******************************************************************/
 165
 166 const char* get_current_username( void )
 167 {
 168         if ( current_user_info.smb_name[0] == '\0' )
 169                 return smb_user_name;
 170
 171         return current_user_info.smb_name;
 172 }
 173
 174 /*******************************************************************
 175  Given a pointer to a %$(NAME) in p and the whole string in str
 176  expand it as an environment variable.
 177  Return a new allocated and expanded string.
 178  Based on code by Branko Cibej <branko.cibej@hermes.si>
 179  When this is called p points at the '%' character.
 180  May substitute multiple occurrencies of the same env var.
 181 ********************************************************************/
 182
 183 static char * realloc_expand_env_var(char *str, char *p)
 184 {
 185         char *envname;
 186         char *envval;
 187         char *q, *r;
 188         int copylen;
 189
 190         if (p[0] != '%' || p[1] != '$' || p[2] != '(') {
 191                 return str;
 192         }
 193
 194         /*
 195          * Look for the terminating ')'.
 196          */
 197
 198         if ((q = strchr_m(p,')')) == NULL) {
 199                 DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
 200                 return str;
 201         }
 202
 203         /*
 204          * Extract the name from within the %$(NAME) string.
 205          */
 206
 207         r = p + 3;
 208         copylen = q - r;
 209
 210         /* reserve space for use later add %$() chars */
 211         if ( (envname = (char *)SMB_MALLOC(copylen + 1 + 4)) == NULL ) {
 212                 return NULL;
 213         }
 214
 215         strncpy(envname,r,copylen);
 216         envname[copylen] = '\0';
 217
 218         if ((envval = getenv(envname)) == NULL) {
 219                 DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
 220                 SAFE_FREE(envname);
 221                 return str;
 222         }
 223
 224         /*
 225          * Copy the full %$(NAME) into envname so it
 226          * can be replaced.
 227          */
 228
 229         copylen = q + 1 - p;
 230         strncpy(envname,p,copylen);
 231         envname[copylen] = '\0';
 232         r = realloc_string_sub(str, envname, envval);
 233         SAFE_FREE(envname);
 234
 235         return r;
 236 }
 237
 238 /*******************************************************************
 239 *******************************************************************/
 240
 241 static char *longvar_domainsid( void )
 242 {
 243         DOM_SID sid;
 244         char *sid_string;
 245
 246         if ( !secrets_fetch_domain_sid( lp_workgroup(), &sid ) ) {
 247                 return NULL;
 248         }
 249
 250         sid_string = SMB_STRDUP( sid_string_static( &sid ) );
 251
 252         if ( !sid_string ) {
 253                 DEBUG(0,("longvar_domainsid: failed to dup SID string!\n"));
 254         }
 255
 256         return sid_string;
 257 }
 258
 259 /*******************************************************************
 260 *******************************************************************/
 261
 262 struct api_longvar {
 263         const char *name;
 264         char* (*fn)( void );
 265 };
 266
 267 struct api_longvar longvar_table[] = {
 268         { "DomainSID",          longvar_domainsid },
 269         { NULL,                 NULL }
 270 };
 271
 272 static char *get_longvar_val( const char *varname )
 273 {
 274         int i;
 275
 276         DEBUG(7,("get_longvar_val: expanding variable [%s]\n", varname));
 277
 278         for ( i=0; longvar_table[i].name; i++ ) {
 279                 if ( strequal( longvar_table[i].name, varname ) ) {
 280                         return longvar_table[i].fn();
 281                 }
 282         }
 283
 284         return NULL;
 285 }
 286
 287 /*******************************************************************
 288  Expand the long smb.conf variable names given a pointer to a %(NAME).
 289  Return the number of characters by which the pointer should be advanced.
 290  When this is called p points at the '%' character.
 291 ********************************************************************/
 292
 293 static char *realloc_expand_longvar(char *str, char *p)
 294 {
 295         fstring varname;
 296         char *value;
 297         char *q, *r;
 298         int copylen;
 299
 300         if ( p[0] != '%' || p[1] != '(' ) {
 301                 return str;
 302         }
 303
 304         /* Look for the terminating ')'.*/
 305
 306         if ((q = strchr_m(p,')')) == NULL) {
 307                 DEBUG(0,("realloc_expand_longvar: Unterminated environment variable [%s]\n", p));
 308                 return str;
 309         }
 310
 311         /* Extract the name from within the %(NAME) string.*/
 312
 313         r = p+2;
 314         copylen = MIN( (q-r), (sizeof(varname)-1) );
 315         strncpy(varname, r, copylen);
 316         varname[copylen] = '\0';
 317
 318         if ((value = get_longvar_val(varname)) == NULL) {
 319                 DEBUG(0,("realloc_expand_longvar: Variable [%s] not set.  Skipping\n", varname));
 320                 return str;
 321         }
 322
 323         /* Copy the full %(NAME) into envname so it can be replaced.*/
 324
 325         copylen = MIN( (q+1-p),(sizeof(varname)-1) );
 326         strncpy( varname, p, copylen );
 327         varname[copylen] = '\0';
 328         r = realloc_string_sub(str, varname, value);
 329         SAFE_FREE( value );
 330
 331         /* skip over the %(varname) */
 332
 333         return r;
 334 }
 335
 336 /*******************************************************************
 337  Patch from jkf@soton.ac.uk
 338  Added this to implement %p (NIS auto-map version of %H)
 339 *******************************************************************/
 340
 341 static char *automount_path(const char *user_name)
 342 {
 343         static pstring server_path;
 344
 345         /* use the passwd entry as the default */
 346         /* this will be the default if WITH_AUTOMOUNT is not used or fails */
 347
 348         pstrcpy(server_path, get_user_home_dir(user_name));
 349
 350 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
 351
 352         if (lp_nis_home_map()) {
 353                 const char *home_path_start;
 354                 const char *automount_value = automount_lookup(user_name);
 355
 356                 if(strlen(automount_value) > 0) {
 357                         home_path_start = strchr_m(automount_value,':');
 358                         if (home_path_start != NULL) {
 359                                 DEBUG(5, ("NIS lookup succeeded.  Home path is: %s\n",
 360                                                 home_path_start?(home_path_start+1):""));
 361                                 pstrcpy(server_path, home_path_start+1);
 362                         }
 363                 } else {
 364                         /* NIS key lookup failed: default to user home directory from password file */
 365                         DEBUG(5, ("NIS lookup failed. Using Home path from passwd file. Home path is: %s\n", server_path ));
 366                 }
 367         }
 368 #endif
 369
 370         DEBUG(4,("Home server path: %s\n", server_path));
 371
 372         return server_path;
 373 }
 374
 375 /*******************************************************************
 376  Patch from jkf@soton.ac.uk
 377  This is Luke's original function with the NIS lookup code
 378  moved out to a separate function.
 379 *******************************************************************/
 380
 381 static const char *automount_server(const char *user_name)
 382 {
 383         static pstring server_name;
 384         const char *local_machine_name = get_local_machine_name();
 385
 386         /* use the local machine name as the default */
 387         /* this will be the default if WITH_AUTOMOUNT is not used or fails */
 388         if (local_machine_name && *local_machine_name)
 389                 pstrcpy(server_name, local_machine_name);
 390         else
 391                 pstrcpy(server_name, global_myname());
 392
 393 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
 394
 395         if (lp_nis_home_map()) {
 396                 int home_server_len;
 397                 char *automount_value = automount_lookup(user_name);
 398                 home_server_len = strcspn(automount_value,":");
 399                 DEBUG(5, ("NIS lookup succeeded.  Home server length: %d\n",home_server_len));
 400                 if (home_server_len > sizeof(pstring))
 401                         home_server_len = sizeof(pstring);
 402                 strncpy(server_name, automount_value, home_server_len);
 403                 server_name[home_server_len] = '\0';
 404         }
 405 #endif
 406
 407         DEBUG(4,("Home server: %s\n", server_name));
 408
 409         return server_name;
 410 }
 411
 412 /****************************************************************************
 413  Do some standard substitutions in a string.
 414  len is the length in bytes of the space allowed in string str. If zero means
 415  don't allow expansions.
 416 ****************************************************************************/
 417
 418 void standard_sub_basic(const char *smb_name, const char *domain_name,
 419                         char *str, size_t len)
 420 {
 421         char *s;
 422
 423         if ( (s = alloc_sub_basic( smb_name, domain_name, str )) != NULL ) {
 424                 strncpy( str, s, len );
 425         }
 426
 427         SAFE_FREE( s );
 428
 429 }
 430
 431 /****************************************************************************
 432  Do some standard substitutions in a string.
 433  This function will return an allocated string that have to be freed.
 434 ****************************************************************************/
 435
 436 char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name,
 437                        const char *domain_name, const char *str)
 438 {
 439         char *a, *t;
 440
 441         if ( (a = alloc_sub_basic(smb_name, domain_name, str)) == NULL ) {
 442                 return NULL;
 443         }
 444         t = talloc_strdup(mem_ctx, a);
 445         SAFE_FREE(a);
 446         return t;
 447 }
 448
 449 /****************************************************************************
 450 ****************************************************************************/
 451
 452 char *alloc_sub_basic(const char *smb_name, const char *domain_name,
 453                       const char *str)
 454 {
 455         char *b, *p, *s, *r, *a_string;
 456         fstring pidstr;
 457         struct passwd *pass;
 458         const char *local_machine_name = get_local_machine_name();
 459
 460         /* workaround to prevent a crash while looking at bug #687 */
 461
 462         if (!str) {
 463                 DEBUG(0,("alloc_sub_basic: NULL source string!  This should not happen\n"));
 464                 return NULL;
 465         }
 466
 467         a_string = SMB_STRDUP(str);
 468         if (a_string == NULL) {
 469                 DEBUG(0, ("alloc_sub_basic: Out of memory!\n"));
 470                 return NULL;
 471         }
 472
 473         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 474
 475                 r = NULL;
 476                 b = a_string;
 477
 478                 switch (*(p+1)) {
 479                 case 'U' :
 480                         r = strdup_lower(smb_name);
 481                         if (r == NULL) {
 482                                 goto error;
 483                         }
 484                         a_string = realloc_string_sub(a_string, "%U", r);
 485                         break;
 486                 case 'G' :
 487                         r = SMB_STRDUP(smb_name);
 488                         if (r == NULL) {
 489                                 goto error;
 490                         }
 491                         if ((pass = Get_Pwnam(r))!=NULL) {
 492                                 a_string = realloc_string_sub(a_string, "%G", gidtoname(pass->pw_gid));
 493                         }
 494                         break;
 495                 case 'D' :
 496                         r = strdup_upper(domain_name);
 497                         if (r == NULL) {
 498                                 goto error;
 499                         }
 500                         a_string = realloc_string_sub(a_string, "%D", r);
 501                         break;
 502                 case 'I' :
 503                         a_string = realloc_string_sub(a_string, "%I", client_addr());
 504                         break;
 505                 case 'i':
 506                         a_string = realloc_string_sub( a_string, "%i", client_socket_addr() );
 507                         break;
 508                 case 'L' :
 509                         if ( StrnCaseCmp(p, "%LOGONSERVER%", strlen("%LOGONSERVER%")) == 0 ) {
 510                                 break;
 511                         }
 512                         if (local_machine_name && *local_machine_name) {
 513                                 a_string = realloc_string_sub(a_string, "%L", local_machine_name);
 514                         } else {
 515                                 a_string = realloc_string_sub(a_string, "%L", global_myname());
 516                         }
 517                         break;
 518                 case 'N':
 519                         a_string = realloc_string_sub(a_string, "%N", automount_server(smb_name));
 520                         break;
 521                 case 'M' :
 522                         a_string = realloc_string_sub(a_string, "%M", client_name());
 523                         break;
 524                 case 'R' :
 525                         a_string = realloc_string_sub(a_string, "%R", remote_proto);
 526                         break;
 527                 case 'T' :
 528                         a_string = realloc_string_sub(a_string, "%T", current_timestring(False));
 529                         break;
 530                 case 'a' :
 531                         a_string = realloc_string_sub(a_string, "%a", remote_arch);
 532                         break;
 533                 case 'd' :
 534                         slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
 535                         a_string = realloc_string_sub(a_string, "%d", pidstr);
 536                         break;
 537                 case 'h' :
 538                         a_string = realloc_string_sub(a_string, "%h", myhostname());
 539                         break;
 540                 case 'm' :
 541                         a_string = realloc_string_sub(a_string, "%m", remote_machine);
 542                         break;
 543                 case 'v' :
 544                         a_string = realloc_string_sub(a_string, "%v", SAMBA_VERSION_STRING);
 545                         break;
 546                 case 'w' :
 547                         a_string = realloc_string_sub(a_string, "%w", lp_winbind_separator());
 548                         break;
 549                 case '$' :
 550                         a_string = realloc_expand_env_var(a_string, p); /* Expand environment variables */
 551                         break;
 552                 case '(':
 553                         a_string = realloc_expand_longvar( a_string, p );
 554                         break;
 555                 default:
 556                         break;
 557                 }
 558
 559                 p++;
 560                 SAFE_FREE(r);
 561
 562                 if ( !a_string ) {
 563                         return NULL;
 564                 }
 565         }
 566
 567         return a_string;
 568
 569 error:
 570         SAFE_FREE(a_string);
 571         return NULL;
 572 }
 573
 574 /****************************************************************************
 575  Do some specific substitutions in a string.
 576  This function will return an allocated string that have to be freed.
 577 ****************************************************************************/
 578
 579 char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
 580                         const char *input_string,
 581                         const char *username,
 582                         const char *domain,
 583                         uid_t uid,
 584                         gid_t gid)
 585 {
 586         char *a_string;
 587         char *ret_string = NULL;
 588         char *b, *p, *s;
 589         TALLOC_CTX *tmp_ctx;
 590
 591         if (!(tmp_ctx = talloc_new(mem_ctx))) {
 592                 DEBUG(0, ("talloc_new failed\n"));
 593                 return NULL;
 594         }
 595
 596         a_string = talloc_strdup(tmp_ctx, input_string);
 597         if (a_string == NULL) {
 598                 DEBUG(0, ("talloc_sub_specified: Out of memory!\n"));
 599                 goto done;
 600         }
 601
 602         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 603
 604                 b = a_string;
 605
 606                 switch (*(p+1)) {
 607                 case 'U' :
 608                         a_string = talloc_string_sub(
 609                                 tmp_ctx, a_string, "%U", username);
 610                         break;
 611                 case 'u' :
 612                         a_string = talloc_string_sub(
 613                                 tmp_ctx, a_string, "%u", username);
 614                         break;
 615                 case 'G' :
 616                         if (gid != -1) {
 617                                 a_string = talloc_string_sub(
 618                                         tmp_ctx, a_string, "%G",
 619                                         gidtoname(gid));
 620                         } else {
 621                                 a_string = talloc_string_sub(
 622                                         tmp_ctx, a_string,
 623                                         "%G", "NO_GROUP");
 624                         }
 625                         break;
 626                 case 'g' :
 627                         if (gid != -1) {
 628                                 a_string = talloc_string_sub(
 629                                         tmp_ctx, a_string, "%g",
 630                                         gidtoname(gid));
 631                         } else {
 632                                 a_string = talloc_string_sub(
 633                                         tmp_ctx, a_string, "%g", "NO_GROUP");
 634                         }
 635                         break;
 636                 case 'D' :
 637                         a_string = talloc_string_sub(tmp_ctx, a_string,
 638                                                      "%D", domain);
 639                         break;
 640                 case 'N' :
 641                         a_string = talloc_string_sub(
 642                                 tmp_ctx, a_string, "%N",
 643                                 automount_server(username));
 644                         break;
 645                 default:
 646                         break;
 647                 }
 648
 649                 p++;
 650                 if (a_string == NULL) {
 651                         goto done;
 652                 }
 653         }
 654
 655         /* Watch out, using "mem_ctx" here, so all intermediate stuff goes
 656          * away with the TALLOC_FREE(tmp_ctx) further down. */
 657
 658         ret_string = talloc_sub_basic(mem_ctx, username, domain, a_string);
 659
 660  done:
 661         TALLOC_FREE(tmp_ctx);
 662         return ret_string;
 663 }
 664
 665 /****************************************************************************
 666 ****************************************************************************/
 667
 668 static char *alloc_sub_advanced(const char *servicename, const char *user,
 669                          const char *connectpath, gid_t gid,
 670                          const char *smb_name, const char *domain_name,
 671                          const char *str)
 672 {
 673         char *a_string, *ret_string;
 674         char *b, *p, *s, *h;
 675
 676         a_string = SMB_STRDUP(str);
 677         if (a_string == NULL) {
 678                 DEBUG(0, ("alloc_sub_advanced: Out of memory!\n"));
 679                 return NULL;
 680         }
 681
 682         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 683
 684                 b = a_string;
 685
 686                 switch (*(p+1)) {
 687                 case 'N' :
 688                         a_string = realloc_string_sub(a_string, "%N", automount_server(user));
 689                         break;
 690                 case 'H':
 691                         if ((h = get_user_home_dir(user)))
 692                                 a_string = realloc_string_sub(a_string, "%H", h);
 693                         break;
 694                 case 'P':
 695                         a_string = realloc_string_sub(a_string, "%P", connectpath);
 696                         break;
 697                 case 'S':
 698                         a_string = realloc_string_sub(a_string, "%S", servicename);
 699                         break;
 700                 case 'g':
 701                         a_string = realloc_string_sub(a_string, "%g", gidtoname(gid));
 702                         break;
 703                 case 'u':
 704                         a_string = realloc_string_sub(a_string, "%u", user);
 705                         break;
 706
 707                         /* Patch from jkf@soton.ac.uk Left the %N (NIS
 708                          * server name) in standard_sub_basic as it is
 709                          * a feature for logon servers, hence uses the
 710                          * username.  The %p (NIS server path) code is
 711                          * here as it is used instead of the default
 712                          * "path =" string in [homes] and so needs the
 713                          * service name, not the username.  */
 714                 case 'p':
 715                         a_string = realloc_string_sub(a_string, "%p",
 716                                                       automount_path(servicename));
 717                         break;
 718
 719                 default:
 720                         break;
 721                 }
 722
 723                 p++;
 724                 if (a_string == NULL) {
 725                         return NULL;
 726                 }
 727         }
 728
 729         ret_string = alloc_sub_basic(smb_name, domain_name, a_string);
 730         SAFE_FREE(a_string);
 731         return ret_string;
 732 }
 733
 734 /*
 735  * This obviously is inefficient and needs to be merged into
 736  * alloc_sub_advanced...
 737  */
 738
 739 char *talloc_sub_advanced(TALLOC_CTX *mem_ctx,
 740                           const char *servicename, const char *user,
 741                           const char *connectpath, gid_t gid,
 742                           const char *smb_name, const char *domain_name,
 743                           const char *str)
 744 {
 745         char *a, *t;
 746
 747         if (!(a = alloc_sub_advanced(servicename, user, connectpath, gid,
 748                                      smb_name, domain_name, str))) {
 749                 return NULL;
 750         }
 751         t = talloc_strdup(mem_ctx, a);
 752         SAFE_FREE(a);
 753         return t;
 754 }
 755
 756
 757 void standard_sub_advanced(const char *servicename, const char *user,
 758                            const char *connectpath, gid_t gid,
 759                            const char *smb_name, const char *domain_name,
 760                            char *str, size_t len)
 761 {
 762         char *s;
 763
 764         s = alloc_sub_advanced(servicename, user, connectpath,
 765                                gid, smb_name, domain_name, str);
 766
 767         if ( s ) {
 768                 strncpy( str, s, len );
 769                 SAFE_FREE( s );
 770         }
 771 }
 772
 773 /****************************************************************************
 774  *  Do some standard substitutions in a string.
 775  *  ****************************************************************************/
 776
 777 void standard_sub_conn(connection_struct *conn, char *str, size_t len)
 778 {
 779         char *s;
 780
 781         s = alloc_sub_advanced(lp_servicename(SNUM(conn)), conn->user, conn->connectpath,
 782                                conn->gid, smb_user_name, "", str);
 783
 784         if ( s ) {
 785                 strncpy( str, s, len );
 786                 SAFE_FREE( s );
 787         }
 788 }
 789