source3/lib/substitute.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    string substitution functions
   4    Copyright (C) Andrew Tridgell 1992-2000
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  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
 111         /* don't let anonymous logins override the name */
 112         if (! *name)
 113                 return;
 114
 115         fstrcpy(tmp,name);
 116         trim_char(tmp,' ',' ');
 117         strlower_m(tmp);
 118         alpha_strcpy(smb_user_name,tmp,SAFE_NETBIOS_CHARS,sizeof(smb_user_name)-1);
 119 }
 120
 121 char* sub_get_smb_name( void )
 122 {
 123         return smb_user_name;
 124 }
 125
 126 /*******************************************************************
 127  Setup the strings used by substitutions. Called per packet. Ensure
 128  %U name is set correctly also.
 129 ********************************************************************/
 130
 131 void set_current_user_info(const userdom_struct *pcui)
 132 {
 133         current_user_info = *pcui;
 134         /* The following is safe as current_user_info.smb_name
 135          * has already been sanitised in register_vuid. */
 136         fstrcpy(smb_user_name, current_user_info.smb_name);
 137 }
 138
 139 /*******************************************************************
 140  return the current active user name
 141 *******************************************************************/
 142
 143 const char* get_current_username( void )
 144 {
 145         if ( current_user_info.smb_name[0] == '\0' )
 146                 return smb_user_name;
 147
 148         return current_user_info.smb_name;
 149 }
 150
 151 /*******************************************************************
 152  Given a pointer to a %$(NAME) expand it as an environment variable.
 153  Return the number of characters by which the pointer should be advanced.
 154  Based on code by Branko Cibej <branko.cibej@hermes.si>
 155  When this is called p points at the '%' character.
 156 ********************************************************************/
 157
 158 static size_t expand_env_var(char *p, int len)
 159 {
 160         fstring envname;
 161         char *envval;
 162         char *q, *r;
 163         int copylen;
 164
 165         if (p[1] != '$')
 166                 return 1;
 167
 168         if (p[2] != '(')
 169                 return 2;
 170
 171         /*
 172          * Look for the terminating ')'.
 173          */
 174
 175         if ((q = strchr_m(p,')')) == NULL) {
 176                 DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
 177                 return 2;
 178         }
 179
 180         /*
 181          * Extract the name from within the %$(NAME) string.
 182          */
 183
 184         r = p+3;
 185         copylen = MIN((q-r),(sizeof(envname)-1));
 186         strncpy(envname,r,copylen);
 187         envname[copylen] = '\0';
 188
 189         if ((envval = getenv(envname)) == NULL) {
 190                 DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
 191                 return 2;
 192         }
 193
 194         /*
 195          * Copy the full %$(NAME) into envname so it
 196          * can be replaced.
 197          */
 198
 199         copylen = MIN((q+1-p),(sizeof(envname)-1));
 200         strncpy(envname,p,copylen);
 201         envname[copylen] = '\0';
 202         string_sub(p,envname,envval,len);
 203         return 0; /* Allow the environment contents to be parsed. */
 204 }
 205
 206 /*******************************************************************
 207  Given a pointer to a %$(NAME) in p and the whole string in str
 208  expand it as an environment variable.
 209  Return a new allocated and expanded string.
 210  Based on code by Branko Cibej <branko.cibej@hermes.si>
 211  When this is called p points at the '%' character.
 212  May substitute multiple occurrencies of the same env var.
 213 ********************************************************************/
 214
 215
 216 static char * realloc_expand_env_var(char *str, char *p)
 217 {
 218         char *envname;
 219         char *envval;
 220         char *q, *r;
 221         int copylen;
 222
 223         if (p[0] != '%' || p[1] != '$' || p[2] != '(')
 224                 return str;
 225
 226         /*
 227          * Look for the terminating ')'.
 228          */
 229
 230         if ((q = strchr_m(p,')')) == NULL) {
 231                 DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
 232                 return str;
 233         }
 234
 235         /*
 236          * Extract the name from within the %$(NAME) string.
 237          */
 238
 239         r = p + 3;
 240         copylen = q - r;
 241         envname = (char *)SMB_MALLOC(copylen + 1 + 4); /* reserve space for use later add %$() chars */
 242         if (envname == NULL) return NULL;
 243         strncpy(envname,r,copylen);
 244         envname[copylen] = '\0';
 245
 246         if ((envval = getenv(envname)) == NULL) {
 247                 DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
 248                 SAFE_FREE(envname);
 249                 return str;
 250         }
 251
 252         /*
 253          * Copy the full %$(NAME) into envname so it
 254          * can be replaced.
 255          */
 256
 257         copylen = q + 1 - p;
 258         strncpy(envname,p,copylen);
 259         envname[copylen] = '\0';
 260         r = realloc_string_sub(str, envname, envval);
 261         SAFE_FREE(envname);
 262         if (r == NULL) return NULL;
 263         return r;
 264 }
 265
 266 /*******************************************************************
 267  Patch from jkf@soton.ac.uk
 268  Added this to implement %p (NIS auto-map version of %H)
 269 *******************************************************************/
 270
 271 static char *automount_path(const char *user_name)
 272 {
 273         static pstring server_path;
 274
 275         /* use the passwd entry as the default */
 276         /* this will be the default if WITH_AUTOMOUNT is not used or fails */
 277
 278         pstrcpy(server_path, get_user_home_dir(user_name));
 279
 280 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
 281
 282         if (lp_nis_home_map()) {
 283                 char *home_path_start;
 284                 char *automount_value = automount_lookup(user_name);
 285
 286                 if(strlen(automount_value) > 0) {
 287                         home_path_start = strchr_m(automount_value,':');
 288                         if (home_path_start != NULL) {
 289                                 DEBUG(5, ("NIS lookup succeeded.  Home path is: %s\n",
 290                                                 home_path_start?(home_path_start+1):""));
 291                                 pstrcpy(server_path, home_path_start+1);
 292                         }
 293                 } else {
 294                         /* NIS key lookup failed: default to user home directory from password file */
 295                         DEBUG(5, ("NIS lookup failed. Using Home path from passwd file. Home path is: %s\n", server_path ));
 296                 }
 297         }
 298 #endif
 299
 300         DEBUG(4,("Home server path: %s\n", server_path));
 301
 302         return server_path;
 303 }
 304
 305 /*******************************************************************
 306  Patch from jkf@soton.ac.uk
 307  This is Luke's original function with the NIS lookup code
 308  moved out to a separate function.
 309 *******************************************************************/
 310
 311 static const char *automount_server(const char *user_name)
 312 {
 313         static pstring server_name;
 314         const char *local_machine_name = get_local_machine_name();
 315
 316         /* use the local machine name as the default */
 317         /* this will be the default if WITH_AUTOMOUNT is not used or fails */
 318         if (local_machine_name && *local_machine_name)
 319                 pstrcpy(server_name, local_machine_name);
 320         else
 321                 pstrcpy(server_name, global_myname());
 322
 323 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
 324
 325         if (lp_nis_home_map()) {
 326                 int home_server_len;
 327                 char *automount_value = automount_lookup(user_name);
 328                 home_server_len = strcspn(automount_value,":");
 329                 DEBUG(5, ("NIS lookup succeeded.  Home server length: %d\n",home_server_len));
 330                 if (home_server_len > sizeof(pstring))
 331                         home_server_len = sizeof(pstring);
 332                 strncpy(server_name, automount_value, home_server_len);
 333                 server_name[home_server_len] = '\0';
 334         }
 335 #endif
 336
 337         DEBUG(4,("Home server: %s\n", server_name));
 338
 339         return server_name;
 340 }
 341
 342 /****************************************************************************
 343  Do some standard substitutions in a string.
 344  len is the length in bytes of the space allowed in string str. If zero means
 345  don't allow expansions.
 346 ****************************************************************************/
 347
 348 void standard_sub_basic(const char *smb_name, char *str,size_t len)
 349 {
 350         char *p, *s;
 351         fstring pidstr;
 352         struct passwd *pass;
 353         const char *local_machine_name = get_local_machine_name();
 354
 355         for (s=str; (p=strchr_m(s, '%'));s=p) {
 356                 fstring tmp_str;
 357
 358                 int l = (int)len - (int)(p-str);
 359
 360                 if (l < 0)
 361                         l = 0;
 362
 363                 switch (*(p+1)) {
 364                 case 'U' :
 365                         fstrcpy(tmp_str, smb_name);
 366                         strlower_m(tmp_str);
 367                         string_sub(p,"%U",tmp_str,l);
 368                         break;
 369                 case 'G' :
 370                         fstrcpy(tmp_str, smb_name);
 371                         if ((pass = Get_Pwnam(tmp_str))!=NULL) {
 372                                 string_sub(p,"%G",gidtoname(pass->pw_gid),l);
 373                         } else {
 374                                 p += 2;
 375                         }
 376                         break;
 377                 case 'D' :
 378                         fstrcpy(tmp_str, current_user_info.domain);
 379                         strupper_m(tmp_str);
 380                         string_sub(p,"%D", tmp_str,l);
 381                         break;
 382                 case 'I' :
 383                         string_sub(p,"%I", client_addr(),l);
 384                         break;
 385                 case 'i' :
 386                         string_sub(p,"%i", client_socket_addr(),l);
 387                         break;
 388                 case 'L' :
 389                         if (local_machine_name && *local_machine_name)
 390                                 string_sub(p,"%L", local_machine_name,l);
 391                         else {
 392                                 pstring temp_name;
 393
 394                                 pstrcpy(temp_name, global_myname());
 395                                 strlower_m(temp_name);
 396                                 string_sub(p,"%L", temp_name,l);
 397                         }
 398                         break;
 399                 case 'M' :
 400                         string_sub(p,"%M", client_name(),l);
 401                         break;
 402                 case 'R' :
 403                         string_sub(p,"%R", remote_proto,l);
 404                         break;
 405                 case 'T' :
 406                         string_sub(p,"%T", timestring(False),l);
 407                         break;
 408                 case 'a' :
 409                         string_sub(p,"%a", remote_arch,l);
 410                         break;
 411                 case 'd' :
 412                         slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
 413                         string_sub(p,"%d", pidstr,l);
 414                         break;
 415                 case 'h' :
 416                         string_sub(p,"%h", myhostname(),l);
 417                         break;
 418                 case 'm' :
 419                         string_sub(p,"%m", get_remote_machine_name(),l);
 420                         break;
 421                 case 'v' :
 422                         string_sub(p,"%v", SAMBA_VERSION_STRING,l);
 423                         break;
 424                 case '$' :
 425                         p += expand_env_var(p,l);
 426                         break; /* Expand environment variables */
 427                 case '\0':
 428                         p++;
 429                         break; /* don't run off the end of the string */
 430
 431                 default: p+=2;
 432                         break;
 433                 }
 434         }
 435 }
 436
 437 static void standard_sub_advanced(int snum, const char *user,
 438                                   const char *connectpath, gid_t gid,
 439                                   const char *smb_name, char *str, size_t len)
 440 {
 441         char *p, *s, *home;
 442
 443         for (s=str; (p=strchr_m(s, '%'));s=p) {
 444                 int l = (int)len - (int)(p-str);
 445
 446                 if (l < 0)
 447                         l = 0;
 448
 449                 switch (*(p+1)) {
 450                 case 'N' :
 451                         string_sub(p,"%N", automount_server(user),l);
 452                         break;
 453                 case 'H':
 454                         if ((home = get_user_home_dir(user)))
 455                                 string_sub(p,"%H",home, l);
 456                         else
 457                                 p += 2;
 458                         break;
 459                 case 'P':
 460                         string_sub(p,"%P", connectpath, l);
 461                         break;
 462                 case 'S':
 463                         if ( snum != -1 )
 464                                 string_sub(p,"%S", lp_servicename(snum), l);
 465                         break;
 466                 case 'g':
 467                         string_sub(p,"%g", gidtoname(gid), l);
 468                         break;
 469                 case 'u':
 470                         string_sub(p,"%u", user, l);
 471                         break;
 472
 473                         /* Patch from jkf@soton.ac.uk Left the %N (NIS
 474                          * server name) in standard_sub_basic as it is
 475                          * a feature for logon servers, hence uses the
 476                          * username.  The %p (NIS server path) code is
 477                          * here as it is used instead of the default
 478                          * "path =" string in [homes] and so needs the
 479                          * service name, not the username.  */
 480                 case 'p':
 481                         if ( snum != -1 )
 482                                 string_sub(p,"%p", automount_path(lp_servicename(snum)), l);
 483                         break;
 484                 case '\0':
 485                         p++;
 486                         break; /* don't run off the end of the string */
 487
 488                 default: p+=2;
 489                         break;
 490                 }
 491         }
 492
 493         standard_sub_basic(smb_name, str, len);
 494 }
 495
 496 /****************************************************************************
 497  Do some standard substitutions in a string.
 498  This function will return an allocated string that have to be freed.
 499 ****************************************************************************/
 500
 501 char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name, const char *str)
 502 {
 503         char *a, *t;
 504         a = alloc_sub_basic(smb_name, str);
 505         if (!a) return NULL;
 506         t = talloc_strdup(mem_ctx, a);
 507         SAFE_FREE(a);
 508         return t;
 509 }
 510
 511 char *alloc_sub_basic(const char *smb_name, const char *str)
 512 {
 513         char *b, *p, *s, *t, *r, *a_string;
 514         fstring pidstr;
 515         struct passwd *pass;
 516         const char *local_machine_name = get_local_machine_name();
 517
 518         /* workaround to prevent a crash while lookinf at bug #687 */
 519
 520         if ( !str ) {
 521                 DEBUG(0,("alloc_sub_basic: NULL source string!  This should not happen\n"));
 522                 return NULL;
 523         }
 524
 525         a_string = SMB_STRDUP(str);
 526         if (a_string == NULL) {
 527                 DEBUG(0, ("alloc_sub_specified: Out of memory!\n"));
 528                 return NULL;
 529         }
 530
 531         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 532
 533                 r = NULL;
 534                 b = t = a_string;
 535
 536                 switch (*(p+1)) {
 537                 case 'U' :
 538                         r = strdup_lower(smb_name);
 539                         if (r == NULL) goto error;
 540                         t = realloc_string_sub(t, "%U", r);
 541                         break;
 542                 case 'G' :
 543                         r = SMB_STRDUP(smb_name);
 544                         if (r == NULL) goto error;
 545                         if ((pass = Get_Pwnam(r))!=NULL) {
 546                                 t = realloc_string_sub(t, "%G", gidtoname(pass->pw_gid));
 547                         }
 548                         break;
 549                 case 'D' :
 550                         r = strdup_upper(current_user_info.domain);
 551                         if (r == NULL) goto error;
 552                         t = realloc_string_sub(t, "%D", r);
 553                         break;
 554                 case 'I' :
 555                         t = realloc_string_sub(t, "%I", client_addr());
 556                         break;
 557                 case 'L' :
 558                         if (local_machine_name && *local_machine_name)
 559                                 t = realloc_string_sub(t, "%L", local_machine_name);
 560                         else
 561                                 t = realloc_string_sub(t, "%L", global_myname());
 562                         break;
 563                 case 'N':
 564                         t = realloc_string_sub(t, "%N", automount_server(smb_name));
 565                         break;
 566                 case 'M' :
 567                         t = realloc_string_sub(t, "%M", client_name());
 568                         break;
 569                 case 'R' :
 570                         t = realloc_string_sub(t, "%R", remote_proto);
 571                         break;
 572                 case 'T' :
 573                         t = realloc_string_sub(t, "%T", timestring(False));
 574                         break;
 575                 case 'a' :
 576                         t = realloc_string_sub(t, "%a", remote_arch);
 577                         break;
 578                 case 'd' :
 579                         slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
 580                         t = realloc_string_sub(t, "%d", pidstr);
 581                         break;
 582                 case 'h' :
 583                         t = realloc_string_sub(t, "%h", myhostname());
 584                         break;
 585                 case 'm' :
 586                         t = realloc_string_sub(t, "%m", remote_machine);
 587                         break;
 588                 case 'v' :
 589                         t = realloc_string_sub(t, "%v", SAMBA_VERSION_STRING);
 590                         break;
 591                 case '$' :
 592                         t = realloc_expand_env_var(t, p); /* Expand environment variables */
 593                         break;
 594
 595                 default:
 596                         break;
 597                 }
 598
 599                 p++;
 600                 SAFE_FREE(r);
 601                 if (t == NULL) goto error;
 602                 a_string = t;
 603         }
 604
 605         return a_string;
 606 error:
 607         SAFE_FREE(a_string);
 608         return NULL;
 609 }
 610
 611 /****************************************************************************
 612  Do some specific substitutions in a string.
 613  This function will return an allocated string that have to be freed.
 614 ****************************************************************************/
 615
 616 char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
 617                         const char *input_string,
 618                         const char *username,
 619                         const char *domain,
 620                         uid_t uid,
 621                         gid_t gid)
 622 {
 623         char *a, *t;
 624         a = alloc_sub_specified(input_string, username, domain, uid, gid);
 625         if (!a) return NULL;
 626         t = talloc_strdup(mem_ctx, a);
 627         SAFE_FREE(a);
 628         return t;
 629 }
 630
 631 char *alloc_sub_specified(const char *input_string,
 632                         const char *username,
 633                         const char *domain,
 634                         uid_t uid,
 635                         gid_t gid)
 636 {
 637         char *a_string, *ret_string;
 638         char *b, *p, *s, *t;
 639
 640         a_string = SMB_STRDUP(input_string);
 641         if (a_string == NULL) {
 642                 DEBUG(0, ("alloc_sub_specified: Out of memory!\n"));
 643                 return NULL;
 644         }
 645
 646         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 647
 648                 b = t = a_string;
 649
 650                 switch (*(p+1)) {
 651                 case 'U' :
 652                         t = realloc_string_sub(t, "%U", username);
 653                         break;
 654                 case 'u' :
 655                         t = realloc_string_sub(t, "%u", username);
 656                         break;
 657                 case 'G' :
 658                         if (gid != -1) {
 659                                 t = realloc_string_sub(t, "%G", gidtoname(gid));
 660                         } else {
 661                                 t = realloc_string_sub(t, "%G", "NO_GROUP");
 662                         }
 663                         break;
 664                 case 'g' :
 665                         if (gid != -1) {
 666                                 t = realloc_string_sub(t, "%g", gidtoname(gid));
 667                         } else {
 668                                 t = realloc_string_sub(t, "%g", "NO_GROUP");
 669                         }
 670                         break;
 671                 case 'D' :
 672                         t = realloc_string_sub(t, "%D", domain);
 673                         break;
 674                 case 'N' :
 675                         t = realloc_string_sub(t, "%N", automount_server(username));
 676                         break;
 677                 default:
 678                         break;
 679                 }
 680
 681                 p++;
 682                 if (t == NULL) {
 683                         SAFE_FREE(a_string);
 684                         return NULL;
 685                 }
 686                 a_string = t;
 687         }
 688
 689         ret_string = alloc_sub_basic(username, a_string);
 690         SAFE_FREE(a_string);
 691         return ret_string;
 692 }
 693
 694 char *talloc_sub_advanced(TALLOC_CTX *mem_ctx,
 695                         int snum,
 696                         const char *user,
 697                         const char *connectpath,
 698                         gid_t gid,
 699                         const char *smb_name,
 700                         const char *str)
 701 {
 702         char *a, *t;
 703         a = alloc_sub_advanced(snum, user, connectpath, gid, smb_name, str);
 704         if (!a) return NULL;
 705         t = talloc_strdup(mem_ctx, a);
 706         SAFE_FREE(a);
 707         return t;
 708 }
 709
 710 char *alloc_sub_advanced(int snum, const char *user,
 711                                   const char *connectpath, gid_t gid,
 712                                   const char *smb_name, const char *str)
 713 {
 714         char *a_string, *ret_string;
 715         char *b, *p, *s, *t, *h;
 716
 717         a_string = SMB_STRDUP(str);
 718         if (a_string == NULL) {
 719                 DEBUG(0, ("alloc_sub_specified: Out of memory!\n"));
 720                 return NULL;
 721         }
 722
 723         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 724
 725                 b = t = a_string;
 726
 727                 switch (*(p+1)) {
 728                 case 'N' :
 729                         t = realloc_string_sub(t, "%N", automount_server(user));
 730                         break;
 731                 case 'H':
 732                         if ((h = get_user_home_dir(user)))
 733                                 t = realloc_string_sub(t, "%H", h);
 734                         break;
 735                 case 'P':
 736                         t = realloc_string_sub(t, "%P", connectpath);
 737                         break;
 738                 case 'S':
 739                         t = realloc_string_sub(t, "%S", lp_servicename(snum));
 740                         break;
 741                 case 'g':
 742                         t = realloc_string_sub(t, "%g", gidtoname(gid));
 743                         break;
 744                 case 'u':
 745                         t = realloc_string_sub(t, "%u", user);
 746                         break;
 747
 748                         /* Patch from jkf@soton.ac.uk Left the %N (NIS
 749                          * server name) in standard_sub_basic as it is
 750                          * a feature for logon servers, hence uses the
 751                          * username.  The %p (NIS server path) code is
 752                          * here as it is used instead of the default
 753                          * "path =" string in [homes] and so needs the
 754                          * service name, not the username.  */
 755                 case 'p':
 756                         t = realloc_string_sub(t, "%p", automount_path(lp_servicename(snum)));
 757                         break;
 758
 759                 default:
 760                         break;
 761                 }
 762
 763                 p++;
 764                 if (t == NULL) {
 765                         SAFE_FREE(a_string);
 766                         return NULL;
 767                 }
 768                 a_string = t;
 769         }
 770
 771         ret_string = alloc_sub_basic(smb_name, a_string);
 772         SAFE_FREE(a_string);
 773         return ret_string;
 774 }
 775
 776 /****************************************************************************
 777  Do some standard substitutions in a string.
 778 ****************************************************************************/
 779
 780 void standard_sub_conn(connection_struct *conn, char *str, size_t len)
 781 {
 782         standard_sub_advanced(SNUM(conn), conn->user, conn->connectpath,
 783                         conn->gid, smb_user_name, str, len);
 784 }
 785
 786 char *talloc_sub_conn(TALLOC_CTX *mem_ctx, connection_struct *conn, const char *str)
 787 {
 788         return talloc_sub_advanced(mem_ctx, SNUM(conn), conn->user,
 789                         conn->connectpath, conn->gid,
 790                         smb_user_name, str);
 791 }
 792
 793 char *alloc_sub_conn(connection_struct *conn, const char *str)
 794 {
 795         return alloc_sub_advanced(SNUM(conn), conn->user, conn->connectpath,
 796                         conn->gid, smb_user_name, str);
 797 }
 798
 799 /****************************************************************************
 800  Like standard_sub but by snum.
 801 ****************************************************************************/
 802
 803 void standard_sub_snum(int snum, char *str, size_t len)
 804 {
 805         static uid_t cached_uid = -1;
 806         static fstring cached_user;
 807         /* calling uidtoname() on every substitute would be too expensive, so
 808            we cache the result here as nearly every call is for the same uid */
 809
 810         if (cached_uid != current_user.uid) {
 811                 fstrcpy(cached_user, uidtoname(current_user.uid));
 812                 cached_uid = current_user.uid;
 813         }
 814
 815         standard_sub_advanced(snum, cached_user, "", current_user.gid,
 816                               smb_user_name, str, len);
 817 }